Assertion: The diagonals of a || gm bisect each other.
Reason: If the diagonals of a || gm are equal and intersect at right angles, then the parallelogram is a square.
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.

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Solution

(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.

Explanation:
Clearly, assertion (A) is true.
We can easily prove reason (R). So, (R) is also true.
But, reason (R) does not give assertion (A).
Hence, the correct answer is (b)

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​(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion. ​Explanation: Clearly, assertion (A) is true. We can easily prove reason (R). So, (R) is also true. But, reason (R) does not give assertion (A). Hence, the correct answer is (b)

(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.

Explanation:
Clearly, assertion (A) is true.
We can easily prove reason (R). So, (R) is also true.
But, reason (R) does not give assertion (A).
Hence, the correct answer is (b)