Ralph watches the other kindergarten students receive stickers and other rewards from the teacher for sitting at their desks and completing their work. soon, ralph begins to behave like the other kindergarten students. ralph's change in behavior is a demonstration of

Ralph's change in behavior is a demonstration of Modeling.

Explanation: Modeling is the act of learning a new skill by imitation or copying the behaviour of other people. Modeling is also known as observational learning or Social learning.

In modeling a direct instruction does not necessarily happen. An example of modeling can be a teacher keeping their desk nest and arranged so that students can copy.

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."

stable food supply,social structure, government,religion,culture/art,technology and writing/language;