Assertion (A) : A chemical reaction becomes faster at a higher temperature.
Reason (R) : At higher temperature, molecular motion becomes more rapid.
(a) Both (A) and (R) are true and (R) is the correct explanation of (A).
(b) Both (A) and (R) are true but (R) is not a correct explanation of (A).
(c) (A) is true but (R) is false.
(d) (A) is false but (R) is true.