Coelom is absent in

Among the following animals, which one produces the smallest egg?

Consider the following three statements $(A-C)$ and select the option which includes all the correct ones only:
$(A)$ The earthworm shows metameric segmentation.
$(B)$ Platyhelminthes shows organ level of body organisation.
$(C)$ In Aschelminthes,mesogloea is present between ectoderm and endoderm.

Which of the following is correctly matched?

In contrast to Annelids,the Platyhelminthes show

All worms are ........