Three of the following four numbenpairs are alike in a certain way and one is different. Identify the different one.

Options

A. 0.97847222222222
B. `3:5`
C. 0.72291666666667
D. 11 : 13

Answer

C

Explanation

Option A,B and D have set of prime numbers. But ,in option C 17 is prime number but 21 is composite number.
So, set in option C is different from other options.
C is right choice.