The correct option is C Heliopora
Meandrina is a genus of colonial stony coral in the family Meandrinidae. Corals in this genus form massive hemispherical heads or have large flat plates and can grow to a meter across. Meandrina meandrites is found in the Caribbean Sea and the Gulf of Mexico.
Fungia is a genus of mushroom, disc or plate corals in the family Fungiidae. Members of the genus are found growing on reefs in the Indo-Pacific.
Favia is a genus of reef-building stony corals in the family Faviidae. Members of the genus are massive or thickly encrusting colonial corals, either dome-shaped or flat, and a few are foliaceous.
Blue coral is a unique species and is the sole member of its order Helioporacea. Its scientific name is Heliopora coerulea. Blue corals are thus named for their distinctive, permanently blue skeleton, which is generally hidden by greenish-grey or blue polyps.Thus, the correct answer is the option (C), 'Heliopora'.