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.

A mechanism by which an issuer may be able to offer additional bonds to the general public without preparing a new and separate offering circular best describes:
Option A:the grey market.
Option B:a shelf registration.
Option C:a private placement.

Answer: B