Help! I am working on a project in which I have to decide if my topic is a diplomatic event or a debate event or if it is a mixture of both. My topic is The end of Apartheid in South Africa and Truth and Reconciliation Commission.

it's definitely a diplomatic event!!

we need an attachment to see what you are talking about.

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."