Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: The response of plants to elevated concentrations of \(CO_2\) is known as carbon-dioxide fertilization effect. Reason R: Under elevated concentrations of atmospheric \(CO_2\), plants are able to increase their rate of photosynthesis. In the light of above statements, choose the correct answer from the options given below