I'm writing a research project and one of powerpoints im suppose to answer is
tell who any major people who have impacted this topic , here.
what does that mean?

It just means to write about people who were involved greatly. An obvious example would be like if your topic was when the slaves were freed, someone who would be considered a "major" impact would be Abraham Lincoln. Hope this helps :)

The answer is d. prior knowledge. she breaks it into parts in order to figure out what other words have the same parts to the word and put the meanings together.

Ive seen this! its d : )