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.

The potential benefits of allocating a portion of a portfolio to alternative investments include:
Option A:ease of manager selection.
Option B:improvement in the portfolio’s risk–return relationship.
Option C:accessible and reliable measures of risk and return.

Answer: B