Question 413401
Well first you have to know what a prime number is. A prime number (or a prime) is a natural number that has exactly two distinct natural number divisors: 1 and itself.

Ex. 1, 3, 5, 7, 11, 13, 17

Therefore if you had the examples below:

A. 15 + 15

B. 12 + 18

C. 2 + 28

D. 17 + 13


the only one adding two prime numbers is D 17+13 = 30