The correct option is
B Parenchymula
A. Veliger is the larva of molluscs and it develops from trochophore.
B. Auricularia is a genus of fungi that looks like jelly and hence, also called as jelly fungi.
C. Parenchymula is the larva of sponges.
D. Trocchophore is the larva of annelids and molluscs.
Since Leucosolenia is a sponge, its larva is parenchymula.
So, the correct answer is 'Parenchymula'.