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a
two muscle layers - circular and oblique
b
two muscle layers - longitudinal and circular
c
three muscle layers - circular, longitudinal and oblique
d
one muscle layer - longitudinal
answer is B.
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Detailed Solution
The body wall of the earthworm is covered externally by a thin non-cellular cuticle below which is the epidermis, two muscle layers (circular and longitudinal) and an innermost coelomic epithelium.