Two factors that result in a volcano at a plate boundary are..

I don't get what this question is asking.

It's asking what is a volcano? Why is it located at a plate boundary?

http://www.geology.sdsu.edu/how_volcanoes_work/Volcano_tectonic.html

I don't know, I still don't get it, the question is confusing.

Think about heat within the earth that can escape at the boundaries of plates.

The question is asking for two factors that contribute to the formation of a volcano at a plate boundary. In other words, what are the two main reasons or conditions that cause a volcano to form where two tectonic plates meet.