A Marine Biologist Visits Your Biology Class and Begins His

A marine biologist visits your biology class and begins his talk entitled, "Life as a Trochophore." A friend seated next to you asks, "What is a trochophore?" You explain that a trochophore is

A) another name for the veliger stage in earthworm reproduction.
B) a term used to describe a larval form of either the phylum Mollusca or Annelida.
C) another name for the veliger stage in the oyster.
D) similar to a lophophore, but only found in the phylum Annelida.