Explanation

Prostostomous animals are those whose mouth is derived from the blastropore of the embryo and the anus is formed at the opposite end. Animals belonging to phylum-Platyhelminthes, Aschelminthes, Annelida, Mollusca and Arthropoda are prostostomous animals. Apis, indica, honey bee belongs to phylum-Arthropoda, Loligo, a squid belongs to Mollusca and Hirudinaria, a cattle leech belongs to phylum-Annelida. In option (a) Aurelia belongs to Coelenterata, In option (b) Physalia also belongs to coelenterata and option (d) contains echinoderms