Assertion :There is no immediate prospect of identifying the mediator of gravity. Reason: Newton's theory of gravitation requires that the gravitational force be transmitted instantaneously.

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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Both Assertion and Reason are incorrect

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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
There is no immediate prospect of identifying mediator of gravity assertion is true and Newton's theory of gravitational requires gravitational force to be transmitted instantaneously reason is also true but it is not correct explanation so option $(b)$ is correct both assertion and reason are correct but reason is not correct explanation for assertion.

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