Research choices

My three possible choices as research topics are:
1. Chemotherapy, is it helping or hurting?
2. Are women still being taking advantage of?
3. ADD: Did we create it?

I chose the first one because one of my friends brought up that some people refuse chemo because they don't want to feel miserable for the last days they may be alive. I feel that women are constantly being taken advantage of and I want t find statistics that prove it. And the last one is the one I will probably do. I feel like every child now and days is diagnosed with ADD. I want to know if we created it.