Assertion :Internal forces cannot change linear momentum. Reason: Internal forces can change the kinetic energy of a system.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Since internal forces occur pair-wise, sum of all internal forces $= 0$ ; these cannot change the momentum of the system.
When the only forces doing work are internal forces, energy changes forms - from kinetic to potential (or vice versa)

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