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.