The study of snakes is called:

Match the columns and choose the correct combination.

$A$. Polychaeta	$p$. Scorpion
$B$. Trematoda	$q$. Pila
$C$. Arachnida	$r$. Liver Fluke
$D$. Gastropoda	$s$. Nereis
	$t$. Star Fish

The given figure shows four animals $A, B, C$ and $D$. Select the correct option regarding the common features shared by any two of them.

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.

Select the correct match for $X$ and $Y$:

Column $X$ (Phylum)	Column $Y$ (Example)
$(1)$ Protozoa	$(P)$ Bath sponge
$(2)$ Coelenterata	$(Q)$ Liver fluke
$(3)$ Porifera	$(R)$ Jellyfish
$(4)$ Platyhelminthes	$(S)$ Opalina

Which one of the following sets of animals shows a close taxonomic relationship?