The compounded ratio of (2 : 3), (6: 11) and (11 :2) is :  Select:
A) 1 : 2  B) 5 : 9  C) 2 : 1  D) 11 : 24  E) none

Rationale: answer : option c 2 / 3 : 6 / 11 : 11 / 2 = 2 : 1
Answer: C