The correct option is B Platyhelminthes
The phylums Aschelminthes and Platyhelminthes both include endoparasites (a parasite that lives inside the host). A few examples from each phylum are
Aschelminthes - Ascaris (Intestinal worm), Filarial worm, Loa loa (Eye worm), etc.
Platyhelminthes - Planaria, Liverfluke, Tapeworm, etc.