The correct answer is: Option C. What effect does video game violence have on children?
Option C presents a question that offers a broader scope to what information one might find about the subject. The rest of the options can be considered as fragments of Option C alone, as these are specifications or subtopics that may come up just by stablishing Option C as the main research question.
Option C is an effective choice given it can lead to more information with just a single question.
I'm pretty sure it's A. Sorry if it's not.
4. Moreover
as a further matter; besides.
"moreover, glass is electrically insulating" an example :)
1) neither….nor
2)not only ……. But also
3)both…… and
4)either.. or
5)either….or
6)both…. And
7)not only…..but also
8)weather….or
9)both…..and
10)neither….nor