Shyness, the most common form of social anxiety, occurs when a person' s apprehensions are so great that they inhibit his making an expected or desired social response.
【正确答案】 C
【答案解析】解析：句意：害羞是社会焦虑症最常见的形式，发生在一个人忧惧过重，抑制了其做出预期或想要做出的社交反应的时候。inhibit抑制，约束。restrain抑制，制止。discharge放出；解雇。trigger引发，引起。defer推迟，延期。