True coelom appeared first in the course of evolution in

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?

Metamerism or metameric segmentation is a characteristic feature of

In leeches,the suckers are located at .........

Which option shows the maximum number of correct characteristics for the given figure?

Closed circulatory system occurs in