B为什么不对啊

问题如下：

An index tracking the Bloomberg Barclays Global Aggregate Index would most likely have:

选项：

A.

limited security selection.

B.

modest turnover due to changes in market values.

C.

comprehensive exposure to fixed-income markets.

解释：

C is correct. Mutual funds and ETFs that track this benchmark index offer comprehensive exposure to many fixed-income markets with no active security selection and portfolio turnover limited solely to either new issuance or issues no longer meeting inclusion criteria.