Stella, who has always believed that wolves stalk and kill human beings, learns that they are actually quite wary of humans and rarely attack them. consequently, she joins an environmental group that is dedicated to reintroducing wolves to areas where they once lived. this behavior is a reflection of

Accommodation

Explanation:

Accommodation is a term coined by Jean Piaget to explain the way we change our cognitive schemas to be able to include new information. A schema is an orderly pattern of information, meaning we organize information into schemas because it helps us increase our understanding of the world.

In this example, Stella makes room for new knowledge of wolves and accommodates her scheme to incorporate that new information.

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."