The correct option is D Amphiblastula
A. Trochophore is the larva of Annelids and Molluscs.
B. Parenchymula is the larva of Leucosolenia (a sponge).
C. Redia is the larva of Fasciola hepatica (liver fluke).
D. Amphiblastula is the larva of Sycon (a sponge).
So, the correct answer is 'Amphiblastula'.