Which of the following is NOT one of the Five Pillars of Islam? Muslims must pray five times a day.
Muslims must truly believe that there is no God but Muhammad.
Muslim may not eat or drink from sunrise to sunset during Ramadan.
Muslims must be generous to the poor.

Muslim may not eat or drink from sunrise to sunset during Ramadan.

That's a month (holiday?) and is not a pillar.

:)

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."