Given the task definition and input, reply with output. 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.

all mountains are in river
(A) river cant occupy mountains
(B)lot of water is collected in mountains
(C)river supply a great quantity of water
A