,Correct Answer:- C

Explanation:- a : b = 3 : 4 and b : c = 2 : 1 Multiplying the second ratio by 2, we have

a : b = 3 : 4 b : c = 4 : 2

Therefore, a : b : c = 3 : 4 : 2.

⇒ a = 3k, b = 4k, c = 2k.

Since a, b and c are positive integers, their sum should be 9k, a positive integer. From the options, only choice (3), which is 207, is a multiple of 9.