TASK DEFINITION: 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.
PROBLEM: the viruses are good for health
(A) there are many kinds of viruses
(B)the viruses can cause many kind of illness
(C)the viruses can exist in many places

SOLUTION: B

PROBLEM: She lifted a tractor.
(A) Tractors are often black while chairs are green.
(B)A tractor cannot sit in the chair.
(C)A tractor is too heavy for one person.

SOLUTION: C

PROBLEM: Tom gets passed when he tries to cross a concrete wall
(A) a concrete wall is hard and thick
(B)Tom is trying something crazy
(C)human can't cross a concrete wall

SOLUTION:
C