In which phylum of animals do nephridia act as osmoregulatory organs?

Read the following four statements $(A-D)$:
$(A)$ Annelids possess only longitudinal muscles which help in locomotion.
$(B)$ Nephridia do not help in excretion and osmoregulation.
$(C)$ Closed type circulatory system is present in most of annelids.
$(D)$ Members of phylum Annelida are triploblastic,metamerically segmented,and acoelomate.
How many of the above statements are incorrect?

Suctorial mouth occurs in

Which of the following anticoagulants is secreted by a leech?

Movement of coelomic fluid helps in locomotion of

$Aphrodite$,commonly known as sea mouse,is a: