1000 men have provisions for 15 days. If 200 more men join them, for how many days will the provisions last now?  Choose the correct choice from the following:
A) 10.5
B) 12.5
C) 13.5
D) 11.5
E) 11

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