Ms. Smith is a 3rd grade teacher who uses cooperative learning in her classroom

In creating groups of students she equally distributes high-achieving, moderate-achieving, and low-achieving students so there is one student of each category in every group. Based upon the skills of each student, Ms. Smith knows that the high-achieving students can help the moderate-achieving students, and in turn, the moderate-achieving students can help the low-achieving students. It is clear that Ms. Smith is using the principle of ____ in her classroom.
scaffolding
accommodation
assimilation
psychosocial moratorium

scaffolding