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 statements best describes an aspect of the Standards of Professional Conduct? Members and candidates are required to:
Option A:ensure any portfolio mandate followed is fair, accurate, and complete.
Option B:promptly disclose changes that might materially affect investment processes.
Option C:have a reasonable and adequate basis for decisions about client confidentiality.

Answer: B