PLS HELP ASAP 12 POINTS! Which statement best completes the diagram? Horace Mann promotes new
ideas for American schools.
?
A. Most nonwhite students begin attending public school.
B. Religious groups begin to control public schools.
C. Female students are not allowed to attend public schools.
O D. Public schools begin dividing students into grade levels.

imma go with D or A

idk if i got it right so sorry if its wrong :)

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."