Answer: b. food capture
The coral polyps belong to the phyllum of Cnidaria. Each coral polyp exhibit a cup like structure with a ring of tentacles around the opening which is used as both mouth as well as anus. The tentacles possess stinging cells called as nematocyst. The tentacles in the coral polyps helps in capturing the prey in their habitat. They extend their tentacles to capture prey, they first kill the prey by stinging them with a toxic chemical liberated from their nematocyst cells, then they draw the prey towards their mouth.