Assertion: In annelids, longitudinal and circular muscles help in locomtion.
Reason: Aquatic annelid like Nereis is monoecious, and possess lateral appendages, parapodia, which help in swimming.
A. IF both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.