Answer:
It means they r proving that something they believe is right
Explanation:
The answer to your problematic question would indeed be the letter C.
The phrase is "driving" because it's a verbs but acts as a noun
If you have Google docs, go to add-ons and search easy-bib. You put in the site and it gives it back to you in MLA format. If you don't have Google docs, copy and paste this website into your search engine: http://olympus.sandhills.edu/english/wordguide/mlaformat.html