Assertion :Mammals are named so because they have mammary glands. Reason: Mammals are highest evolved.

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 correct 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.
Mammals possess a placenta, body hairs and feed their own babies with their own milk secreted by the mammary glands and so called as mammals.
Mammals are highest evolved but it is not the reason behind it being called as mammals. Thus, the correct answer is option B.

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