Is islam monotheistic or polytheistic religion?

Islam is a monotheistic religion. Islam was based on the teachings of the prophet Muhammad. Muhammad’s teachings are found in the holy book of Islam called the Qur’an. He emphasized the dignity of all human beings and the brotherhood of all people.

what are the options?

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."