Definition: You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.
Input: Question: Out of first 26 natural numbers, one number is selected at random. The probability that it is either an even number or a prime number is -.

 Option A: 1/2

 Option B: 16/19

 Option C: 4/5

 Option D: 21/26

 Option E: 3/5

Option D