The correct option is
A BalanoglossusTornaria is the planktonic larva of some species of
Hemichordata. It is very similar in appearance to the bipinnaria larvae of starfishes, with convoluted bands of cilia running around the body.
Of the given options,
Balanoglossus is hemichordate, while
Herdmania is a urochordate.
So, the correct answer is option A.