The correct option is C Aurelia
Ephyra is a larval stage in the life cycle of Aurelia or jelly fish. The planula larva of a jelly fish forms a fixed polyp-like stage called scyphistoma. Budding in Scyphistoma forms the ephyra larva. The process of the formation of ephyra is called strobilation. One scyphistoma forms several ephyra larvae.