Assertion: The average time of collisions `x` decreases with increasing temperature.
Reason: At increased temperature, average speed of the electrons, which act as the carriers of current increases, resulting in more frequent collisions.
Options:
(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 the correct explanation of A.
(c) A is true but R is false.
(d) A is false and R is also false.