The answer is C attending community college
Once you have decided on a research question
Wax is mostly susceptible to heat.
This means that when wax is found somewhere warm or hot, in a generally heated location, it will melt because it is made of material susceptible to high temperatures and humidity. So, unless you want wax or candles to melt, keep them somewhere cool.
The verb phrase in that sentence is "can take"
It identifies the focus and method of the research project.
AND
it provides important scientific and medical data to the public.