Assertion: The drift velocity of electrons in a metallic wire decreases, when temperature of the wire increases.
Reason: On increasing temperature, conductivity of metallic wire decreases.
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.