Betty is a retired registered nurse who fills in at the local hospital when the staff is in need of nurses. she is frequently called in without advance notice and must take over without any time to get oriented. to quickly grasp the expectations and needs of the situation, betty must rely on what sternberg calls intelligence.

Robert Sternberg formulated the triarchic theory of intelligence that differentiate intelligence in 3 components, componential, experimental and practical.

The one referred in the text is the practical intelligence that is related to adapting to a situation or environment, in this way Betty can become aware of the situation and perform her duties.

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."