Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

In an underwritten offering, the risk that the entire issue may not be sold to the public at the stipulated offering price is borne by the:
Option A:issuer.
Option B:investment bank.
Option C:buyers of the part of the issue that is sold.

Answer: B