问题如下：
Fund 1 focuses on
skillfully timing exposures to factors, both rewarded and unrewarded, and to
other asset classes. The fund’s managers use timing skills to opportunistically
shift their portfolio to capture returns from factors such as country, asset
class, and sector. Fund 1 prefers to make large trades.
选项：
A.alpha skills
position sizing
rewarded factor weightings
解释：
The three main
building blocks of portfolio construction are alpha skills, position sizing,
and rewarded factor weightings. Fund 1 generates active returns by skillfully
timing exposures to factors, both rewarded and unrewarded, and to other asset
classes, which constitute a manager’s alpha skills.
本题前边提到择时，后边又说Fund 1 prefers to make large trades，通过看准机会大笔操作，通过position size获得超额收益？记得视频里说“运气是通过自信加码体现的”，为什么不选B呢
