A. [3, 4, 5, 20, 5, 25, 1]
B. [1, 3, 3, 4, 5, 5, 20, 25]
C. [3, 5, 20, 5, 25, 1, 3]
D. [1, 3, 4, 5, 20, 5, 25]

Solution

A. [3, 4, 5, 20, 5, 25, 1]

Explanation

pop() by default will remove the last element.