What can you conclude would be one change caused by the indian ocean trade network?
a- western europe began to trade more with south asia.
b- muslim societies developed algebra as a result of interactions with indian
merchants.
c-arab merchants falsely claimed to invent zero and took credit for indian
accomplishments.
d-the process of "southernization" did not take place until after
"westernization" had occurred.

i think you really need to revive you answer! : d

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."