Context: The passage below describes an experiment. Read the passage and then follow the instructions below.

Ellen applied a thin layer of wax to the underside of her snowboard and rode the board straight down a hill. Then, she removed the wax and rode the snowboard straight down the hill again. She repeated the rides four more times, alternating whether she rode with a thin layer of wax on the board or not. Her friend Lamar timed each ride. Ellen and Lamar calculated the average time it took to slide straight down the hill on the snowboard with wax compared to the average time on the snowboard without wax.
Figure: snowboarding down a hill.
Identify the question that Ellen and Lamar's experiment can best answer.
A. Does Ellen's snowboard slide down a hill in less time when it has a layer of wax or when it does not have a layer of wax?
B. Does Ellen's snowboard slide down a hill in less time when it has a thin layer of wax or a thick layer of wax?
From the given choices, select the correct answer and reply with the letter of the chosen option.

A