Which of the following statements is correct regarding lancelets?

A) The first fossils resembling lancelets appeared in the fossil record around 10 million years ago.
B) Recent work in molecular systematics supports the hypothesis that lancelets are the basal clade of chordates.
C) The extant lancelets are the immediate ancestors of the fishes.
D) Lancelets do not swim in the same way that fishes do.