1000 boys have provisions for 15 days. If 200 more men join them, for how many days will the provisions last now? Choose the most appropriate option:
A) 12
B) 12.5
C) 13
D) 13.5
E) 14

Rationale: explanation : 1000 * 15 = 1200 * x x = 12.5 b
Answer: B