In the ceiling zone method of distribution, the usable floor area should be divided into zones each measuring:
A . 9.3 sq m (100 sq ft) to 23 sq m (250 sq ft)
B . 23 sq m (250 sq ft) to 56 sq m (600 sq ft)
C . 23 sq m (250 sq ft) to 84 sq m (904 sq ft)
D . 56 sq m (600 sq ft) to 84 sq m (904 sq ft)
E . 56 sq m (600 sq ft) to 100 sq m (1,100 sq ft)
Answer: C
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