The forest lands of Gradwitz were of wide extent and well stocked with game; the narrow strip of precipitous woodland that lay on its outskirt was not remarkable for the game it harboured or the shooting it "afforded, but it was the most jealously guarded of all its owner's territorial possessions. A famous law suit, in the days of his grandfather, had wrested it from the illegal possession of a neighbouring family of petty landowners; the dispossessed party had never acquiesced in the judgment of the Courts, and a long series of poaching affrays and similar scandals had embittered the relationships between the families for three generations. The neighbour feud had grown into a personal one since Ulrich had come to be head of his family; if there was a man in the world whom he detested and wished ill to it was Georg Znaeym, the inheritor of the quarrel and the tireless game-snatcher and raider of the disputed border-forest. The feud might, perhaps, have died down or been compromised if the personal ill-will of the two men had not stood in the way. As boys they had thirsted for one another's blood, as men each prayed that misfortune might fall on the other, and this windscourged winter night Ulrich had banded together his foresters to watch the dark forest, not in quest of fourfooted quarry, but to keep a look-out for the prowling thieves whom he suspected of being afoot from across the land boundary. The roebuck, which usually kept in the sheltered hollows during a storm-wind, were running like driven things tonight, and there was movement and unrest among the creatures that were wont to sleep through the dark hours. Assuredly there was a disturbing element in the forest, and Ulrich could guess the quarter from whence it came.
The two enemies stood glaring at one another for a long silent moment. Each had a rifle in his hand, each had hate in his heart and murder uppermost in his mind. The chance had come to give full play to the passions of a lifetime. But a man who has been brought up under the code of a restraining eivilisation cannot easily nerve himself to shoot down his neighbour in cold blood and without word spoken, except for an offence against his hearth and honour. And before the moment of hesitation had given way to action a deed of Nature's own violence overwhelmed them both. A fierce shriek of the storm had been answered by a splitting crash over their heads, and ere they could leap aside a mass of falling beech tree had thundered down on them. Ulrich yon Gradwitz found himself stretched on the ground, one arm numb beneath him and the other held almost as helplessly in a tight tangle of forked branches, while both legs were pinned beneath the fallen mass. His heavy shooting-boots had saved his feet from being crushed to pieces, but if his fractures were not as serious as they might have been, at least it was evident that he could not move from his present position till some one came to release him. The descending twig had slashed the skin of his face, and he had to wink away some drops of blood from his eyelashes before he could take in a general view of the disaster. At his side, so near that under ordinary circumstances he could almost have touched him, lay Georg Znaeym, alive and struggling, but obviously as helplessly pinioned down as himself. All round them lay a thick-strewn wreckage of splintered branches and broken twigs.
We know from the first paragraph that Ulrich von Gradwitz

A. patrolled the forest regularly.
B. expected to chase a game.
C. was on guard against a person.
D. had a keen sense of hearing.