Final answer:
A closed-ended question is one that restricts respondents to specific answers, used to collect quantitative data, as opposed to open-ended questions, which allow for elaboration and result in qualitative data.
Step-by-step explanation:
A closed-ended question is one that limits the respondent's answer to a set of specific options. This type of question restricts the extent to which the respondent can provide an answer, thereby collecting quantitative data that can be easily counted and statistically analyzed. In contrast, open-ended questions allow for more elaboration and discussion, leading to qualitative data.
Therefore, the correct answer to what a closed-ended question means is C. A question that restricts the respondent to a set of specific answers or options.