True or False questions are effective because they allow students to:

The effectiveness of true or false questions primarily lies in the ability for students to answer many questions in a short amount of time. This format simplifies the response process, as students only need to evaluate whether a statement is correct or incorrect, allowing them to rapidly assess their knowledge across a range of topics. This efficiency can be particularly beneficial in classroom settings or exams where there is a time constraint, enabling instructors to cover more material and gauge understanding without requiring extensive written responses.

While other options may touch on aspects of assessment or student engagement, they do not align as closely with the specific advantage that true or false questions offer in terms of time management in responding to multiple statements.