Step 1: Definition.
A double-barreled question combines two or more distinct ideas in a single question, forcing respondents to give one answer to multiple issues (e.g., “Do you find the service fast and reliable?”).
Step 2: Eliminate alternatives.
- (a) Structured question: any fixed-response question, not necessarily two issues.
- (b) Dichotomous: two-option (Yes/No) format.
- (d) Branching: directs respondent to a follow-up based on prior answer.
\[
\boxed{(c)}
\]