听力原文： (9) A 12-storey building has collapsed in the Egyptian capital Cairo after a fire in the lower floors. A number of people are trapped in the wreckage and about 30 people were injured. The fire broke out in the ground floor of the 12-storey building in the modern suburb of Cairo. Police officials say it started in a fast food restaurant or possibly in an adjacent home appliances shop. Hundreds of residents lived in the apartment block. They were able to leave before the building collapsed 3 hours after the fire started. (10) Policemen and firemen, however, were trapped when the upper floors came crashing down. Working under floodlights, their colleagues have been battling to free them from the rabble. The governor of Cairn said the collapsed building had planning permission for 4 floors only. But at least 7 other floors were added on illegally.
The fire broke out in ______ of the 12-storey building.

A. the ground floor
B. the second floor
C. the fourth floor
D. the seventh floor