Along-term committed partnership correlates with health and happiness throughout adulthood and late adulthood. for most people, then, is the crucial aspect of love in a partnership. intimacy infatuation commitment passion

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."

answer; /// you data to develop general ideas or theories;