I'll give you a question, please answer with step-by-step reasoning process.
The inverse ratio of 3: 2: 1 is?\nOptions:\n(A) 2:9:5\n(B) 2:3:0\n(C) 2:3:5\n(D) 2:3:6\n(E) 2:3:1

(D)
1/3: 1/2: 1/1 = 2:3:6.

The answer: (D)