Which story problem can be solved by finding the value of the expression below?

A.
A farmer has a rectangular farm that is 3 kilometers long and of a kilometer wide. What is the area of the farm?
B.
Harry has a wire that is 3 meters long. He cuts the wire into pieces that are of a meter each. How many pieces of wire does Harry have?
C.
Ryan’s mother bought 3 pounds of strawberries. Ryan ate pound of the strawberries. How many pounds of strawberries did Ryan eat?
D.
John bought 3 apple pies. His younger sister ate of an apple pie. How much apple pie does John have left?