In which region is the tuft of nephridia found in earthworms?

Answer the following:
How many types of nephridia are found in earthworm based on their location?

Which of the following is responsible for destroying bacteria on the body surface of an earthworm?

The septal nephridia of an earthworm discharge their excretory products into the.........

Choose the correct option for the following statements:
$(i)$ Earthworms have $4$ pairs of lateral hearts.
$(ii)$ The excretory organs of earthworms are nephridia.

The given figure shows the nephridial system of an earthworm. Identify the endonephric nephridia from the labels $A$,$B$,and $C$.