Answer:
The best answer to the question: What topics should she research if she wanted to support the statements of Speaker 2, would be:
1. Criminal statistics according to age groups, to see if it is true or not that people under 18 present more criminal tendencies than older ones.
2. Criminal statistics of youth after a certain hour, particularly after dark. These will allow Jan to acquire enough arguments to show if indeed it is true that young teenagers are more prone to become criminals after dark. This leads to another set of information Jan would need, which would be criminal statistics, per age group, during daylight hours. This last one would show if criminal activity at young ages, is present more during night, or daytime.
3. She could consult research as well on the effects of such a drastic measure as curfew on the minds of young people, especially since the reason for doing so is arguing that young people tend towards criminal activities if they are let to roam free at night.
4. Research different theories on how young people can develop a sense of responsibility, that comes through education, rather than punishment.
These are only a few ideas. There could be more that Jan could research in order to support the statement of Speaker 2 against an idea as dramatic as a curfew.