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

a.
ryan’s mother bought 3 pounds of strawberries. ryan ate pound of the strawberries. how many pounds of strawberries did ryan eat?
b.
john bought 3 apple pies. his younger sister ate of an apple pie. how much apple pie does john have left?
c.
a farmer has a rectangular farm that is 3 kilometers long and of a kilometer wide. what is the area of the farm?
d.
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?