The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Population of predator is generally small because if predator is too efficient or too many in number they may over exploit it's prey which may extinct and following it, predator will also extinct so, predator checks the population of prey but do not extinct them. So the correct option is "Both Assertion and Reason are correct but Reason is not correct explanation for Assertion"