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 regarding sector indexes is most accurate? Sector indexes:
Option A:track different economic sectors and cannot be aggregated to represent the equivalent of a broad market index.
Option B:provide a means to determine whether an active investment manager is more successful at stock selection or sector allocation.
Option C:apply a universally agreed upon sector classification system to identify the constituent securities of specific economic sectors, such as consumer goods, energy, finance, health care.

Answer: B