没懂这题解题思路

问题如下：

Consider a active management strategies: individual stock selection with a benchmark composed of 100 securities, IC = 0.05.

The active security returns are uncorrelated, and forecasts are independent from year to year.

The breadth of this active management strategy is closest to:

选项：

A.

100

B.

5

C.

0.05

解释：

A is correct.

Given that the active asset returns in strategy are uncorrelated, and forecasts are independent from year to year, the breadth of the strategy is BR = 100