A teacher takes her class to the past in a time machine to investigate their roots.
Answer: The answer would be B
Explanation: I'm assuming he timeline is showing the project they are going to do for the next race, so B would be your answer
The answer to your question is C
Debate are formal discussions on particular subjects, such as those as on conflict. Conflict often leads to arguments and disagreements, etc.
So in other words, debate, like discussing on how to do things, can solve conflict and male things easier.