Although hannah understands the principle of conservation and basic mathematical operations, she has difficulty understanding hypothetical questions and attempts to solve problems unsystematically, by trial and error. according to piaget, hannah has not yet attained the cognitive skills characteristic of the stage.

the packers and the chiefs played in the first super bowl, which was held in los angeles in 1967. -is the sentence that would stand out the most when scanning a paragraph.

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."