Assertion: Resistance of a wire is directly proportional to its length. When the length becomes thrice its cross-sectional area is reduced to (A/3).
Reason: The volume of the wire remains constant.
a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
b) Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
c) Assertion is true, but Reason is false.
d) Both Assertion and Reason are false.