The correct answers are: 1, 3 and 4.
Jaden would be an effective participant in the group discussion because he has carried out thorough research on the subject, and therefore will be able to answer questions correctly.
He has also reviewed available material, such as teacher's feedback reports from previous science projects.
And at the same time he has researched projects from past science fairs, so he can support his oppinions on their success or failure.