Suppose We Create a Deque (Double-Ended Queue) Data Structure

Multiple Choice

Suppose we create a deque (double-ended queue) data structure. It is basically a queue, with its addLast and removeFirst operations, but we also add the addFirst and removeLast operations. If a line at the grocery store resembles a deque more than a queue, what is the most likely reason?
I the cashier is very fast
II the line is very long
III the cashier is very slow

A) I
B) II
C) I and II
D) II and III