Suppose U = {1, 2 , 3, 4, 5} is the universal set and A = {1, 5}. What is A' ?

A. A' = {1, 2 , 3, 4, 5}
B. A' = {2 , 3, 4}
C. A' = {1, 2 , 3, 4}
D. A' = {2 , 3, 4, 5}