explain vygotsky’s zone of proximal development and how it relates to instruction in the early childhood classroom. provide an example of the zone of proximal development relevant to early childhood education.

it is the boston port act

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."