Which of the Following Algorithms Would Be Efficiently Executed on an ArrayList

Multiple Choice

Which of the following algorithms would be efficiently executed on an ArrayList?

A) remove first n / 2 elements from a list of n elements
B) add 1 element to the middle of a list with n elements
C) add n / 2 elements to a list with n / 2 elements
D) read n / 2 elements in random order from a list of n elements