The largest prime number less than 30 that can be written as the sum of two primes is
(A) 29
(B) 23
(C) 19
(D) 17
(E) 13
Every prime number, with the exception of 2, is an odd number. To write an odd number as the sum of two whole numbers, one must be an even number and one must be an odd number.

So in this case, we want to write a prime as the sum of an odd prime number and an even prime number. Since the only even prime number is 2 , then we want to write a prime number as 2 plus another prime number.

From highest to lowest, the prime numbers less than 30 are 29, 23, 19, 17, 13, 11, 7, 5, 3 and 2 .

The largest prime less than 30 which is 2 more than another prime number is 19 .

ANSWER: (C)