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.

With respect to the formation of portfolios, which of the following statements is most accurate?
Option A:Portfolios affect risk less than returns.
Option B:Portfolios affect risk more than returns.
Option C:Portfolios affect risk and returns equally.

Answer: B