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 is an example of an activity that may be legal but that CFA Institute considers unethical?
Option A:Making legally required disclosures in marketing materials
Option B:Trading while in possession of material nonpublic information
Option C:Disclosure by an employee of his or her own company’s dishonest activity

Answer: B