Illuminated manuscripts have historically been created and used by which two religious faiths?
a. christianity and islamic
c. hinduism and catholicism
b. hinduism and buddhism
d. islamic and buddhism

I go with letter a. Christianity and Islamic.  Illumination began with monks in Europe producing small illustration at the corners of the pages.  Muslims also made use of illuminations in their works. Illuminated manuscripts were highly prized during period.  Many patrons ordered such works.

answer to ur question is college b

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."