Which fraction is equivalent to 9/13?

A. 6/10

B. 2/3

C. 36/52

D. 16/20

9/13 is not a fraction that can be simplified: the two numbers don't have a divisor in common.

Let's bring all the other fractions into their simplest form too:

A. 6/10=3/5

B. 2/3 This is the simplest form already

C. 36/52 = 18/26=9/13 (I divided both numbers by 2 each time)

... and we don't have to look further, we have already found the right answer: 9/13 is equivalent to 36/52.