medium · LSAT Logical Reasoning
Students who participate in the high school's voluntary peer-tutoring program earn higher grades than students who do not participate. The principal concluded that the peer-tutoring program improves students' grades.
Which one of the following, if true, most strengthens the principal's conclusion?
- With random peer-tutoring assignment, assigned participants earned higher grades than assigned nonparticipants.
- The peer tutors are themselves high-achieving students.
- Students joining peer tutoring tend to be more academically motivated than students who do not join.
- Grades across the school have risen modestly over the past several years.
- Assigned tutoring students knew their status and received additional praise from teachers throughout the term.
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