As we age, we progress through different social roles that change and complicate our identities -- we become students, husband, wives, partners, workers and parents. social gerontologists refer to these changes as

Role transition.

Explanation:

As we grow older, we advance through various social positions that alter and hinder our identities — we become learners, husbands, wives, associates, employees, and parents. Social gerontologists name these alterations as role transition.

This method relates to the physical and psychological motion between roles in social system, including roll out from one ROLE and subsequent involvement in another.

sir frederic attributed inaccuracies to schemas. memory reconstruction is one part actual events and one part personal schema, which can result in inaccuracies when memories are reconstructed.

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."