(A) The correct answer is $A$. $Hydra$ belongs to the phylum $Cnidaria$ (or $Coelenterata$),not $Annelida$. $Ascaris$ is a member of $Nemathelminthes$

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(A) The correct answer is $A$. $Hydra$ belongs to the phylum $Cnidaria$ (or $Coelenterata$),not $Annelida$. $Ascaris$ is a member of $Nemathelminthes$ (or $Aschelminthes$). $Cockroach$ is a member of $Arthropoda$. $Starfish$ is a member of $Echinodermata$. Therefore,the pair $Annelida - Hydra$ is mismatched.