Reason
Custom is source of law but by itself is not law.
Assertion
Custom per se is law, independent of prior by the sovereign or the judge.
Custom per se is law, independent of prior by the sovereign or the judge.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B
Assertion is correct but Reason is incorrect
C
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
D
Assertion is incorrect but Reason is correct
Correct option is D. Assertion is incorrect but Reason is correct
Customs are not enforceable by law, but are still prevalent in society and have societal sanctions attached to them.
Custom is source of law but by itself is not law.
Hence, option (D) is correct.