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.

Reconstitution of a security market index reduces:
Option A:portfolio turnover.
Option B:the need for rebalancing.
Option C:the likelihood that the index includes securities that are not representative of the target market.

Answer: C