Cậu ơi, cho t hỏi bài này với, t post lên forum mà chả ai trả lời tớ

1. Which of the following statements regarding sector indices is most accurate? Sector indices
A. track different economic sectors and cannot be aggregate to represent the equivalent of a broad market index
B. provide a means to determine whether an active investment manager is more successful at stock selection or sector allocation
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.
Tại sao câu này không chọn ý A hả c? =.=
2. An aggregate fixed-income index
A. comprises corporate and asset-backed securities
B. represents the market of government - issued securities
C. can be subdivided by market or economic sector to create more narrowly defined indices.
Aggregate fixed-income là gì c nhỉ?