If the gyrocompass error is east，what describes the error and the correction to be made to gyrocompass headings to obtain true headings?（）.
A. The readings are too low (small numerically) and the amount of the error must be added to the compass to obtain true
B. The readings are too low and the amount of the error must be subtracted from the compass to obtain true
C. The readings are too high (large numerically) and the amount of the error must be added to the compass to obtain true
D. The readings are too high and the amount of the error must be subtracted from the compass to obtain true
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