Correct answer is D:

Calculated Load [see 220.40]
General Lighting Load: 3120 sq ft at 3 VA per sq ft = 9360 VA
Minimum Number of Branch Circuits Required [see 210.11(A)]
General Lighting Load: 9360 VA ÷ 120 V = 78 A
Required circuits: 78 A ÷ 15 A = 5.2
This requires six 15-A, 2-wire circuits.

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