Context: After Edgar cleans up a spill, he hangs a wet cloth towel in the laundry room. Two hours later, he notices that the towel has partially dried. He wonders what factors affect how cloth dries. So, he decides to design an experiment. He has the following supplies available:
two identical white cloth towels
water
a clothesline in the laundry room
a clothesline in the backyard
Using only these supplies, which question can Edgar investigate with an experiment?
A. Do cloth towels dry faster if they are hung in the laundry room or in the backyard?
B. When hung in the laundry room, do black cloth towels or white cloth towels dry more quickly?
C. Does a small cloth towel or a large cloth towel dry faster when hung in the backyard?
Answer with the option's letter from the given choices directly.

A