Pharyngeal nephridia in $Pheretima$ are found in segments:

Earthworm shows locomotion by means of

Enteronephric nephridia of Earthworm are:

In earthworms,fertilization occurs in the ......?

Identify the incorrect statements among the following:
$(a)$ In earthworm,a single male genital pore is present.
$(b)$ Setae help in locomotion of earthworm.
$(c)$ The muscular layer in the body wall of earthworm is made up of only circular muscles.
$(d)$ Typhlosole is a part of the intestine of earthworm.

Mark the correct statement regarding earthworm.