These Teachers Are Using Peer Tutoring in Their Class

These teachers are using peer tutoring in their class.Which one is most likely to be effective?

A) Ms.Harper provides a framework for tutoring sessions.
B) Ms.Klein has tutors deign all of their own learning objectives.
C) Mr.Smith allows high-achieving students to be tutors.
D) Mr.Ross hires trained professionals to tutor the students in his class.