young people see and hear in the media helps them to figure out how the world works.
A. Which
B. That
C. What
D. How
网友回答
A. Which
B. That
(答案→)C. What
D. How
解析：考查主语从句。本题中的what在句中做主语what young people see and hear in the media在句中做动词see和hear的宾语。句意：年轻人在媒体上看见和听见的内容帮助他们搞清楚这个世界是如何运转的。That在句中不充当成分，how在句中做状语。Which是指特定范围之内的某一个。故C正确。