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.

An aggregate fixed-income index:
Option A:comprises corporate and asset-backed securities.
Option B:represents the market of government-issued securities.
Option C:can be subdivided by market or economic sector to create more narrowly defined indexes.

Answer: C