Answer:
The vandalizing of several school buses by EAPA students.
The answer should be A. This is because the other sentences don't need any word except for the first word in its sentence.
In the answer choice A, partners in Water partners should be capitalized because it is an organization. Therefore the sentence should be...
"<span>It was started in 2009 by actor Matt Damon and Gary White, the co-founder of Water Partners."</span>
It would cause the reader to think that too. and it could confuse the reader if the assumption is contradicted later on in the story.
hope i helped!