For the following sum, determine whether the result is rational or irrational and choose the appropriate reason.  
5/8 + √8

A: The result is irrational because the sum of a rational number and an irrational number is always irrational.

B: The result is irrational because the sum of two irrational numbers is sometimes irrational. 

C: The result is rational because the sum of two rational numbers is always rational. 

D: The result is rational because the sum of a rational number and an irrational number is sometimes rational.