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.

Which of the following best describes a negative bond covenant? The issuer is:
Option A:required to pay taxes as they come due.
Option B:prohibited from investing in risky projects.
Option C:required to maintain its current lines of business.

Answer: B