In this task, you are given an impractical statement. You are also given three reasons (associated with "A", "B", "C") explaining why this statement doesn't make sense. You must choose the most corresponding reason explaining why this statement doesn't make sense.

[EX Q]: He waved hands at his bike
(A) Bike is not a human and no one waves at bike
(B)Bike is not turned on
(C)Bike did not have fuel
[EX A]: A

[EX Q]: Iron is the lightest metal
(A) Both iron and aluminum are metals
(B)Iron and aluminum have some of the same chemical properties
(C)The atomic mass of iron is larger than that of aluminum
[EX A]: C

[EX Q]: Students teach teachers
(A) students are not smart
(B)students are too young
(C)Students learn and teachers teach
[EX A]:
C