Janie Is a Preschooler Who Is Learning to Put Together

Janie is a preschooler who is learning to put together puzzles. Which circumstance will enhance her mastery of this skill, according to research on the zone of proximal development and scaffolding?

A) If an older peer babysits her and works on the puzzles with her
B) If her big sister is available to work with her on puzzles
C) If she has a twin who can do the puzzles with her and they learn together
D) If she works on the puzzles alone