Which noun form corresponds to the verb 'respond'?
答案解析
**Core Concept:** Vocabulary - Word Formation
**Analysis:** 'Response' (C) is the direct noun form of 'respond.' 'Responsibility' (A) relates to duties, 'Respondent' (B) refers to a person, and 'Responsive' (D) is an adjective.
**Key Point:** '-ponse' → '-ponse' noun suffix.
**Common Mistake:** Choosing phonetically similar options like 'responsible.'
正确答案：C