Action and reaction forces do not cancel each other because :

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They are equal, but not always the exact opposite.

They are unequal in magnitude even though opposite in direction.

They act on different bodies.

They are neither equal in magnitude nor opposite in direction.

answer is C.

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Detailed Solution

Action and reaction exist in pairs and are always equal in magnitude and opposite in direction. But they act on different bodies, hence they do not cancel each other.
For example, When a man standing off a platform jumps off the platform, the man exerts a force on the platform and in return the platform exerts an equal and opposite force on the man.
In this example, we can see that action-reaction forces are applied on two different bodies, action is applied on the platform and the reaction force is exerted on the man.

Therefore, we can say that action and reaction forces do not cancel each other because they are act on two different bodies.

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