During a trial, what provides members of the jury with an outline of the major objectives of each side's case, the evidence to be presented, the witnesses to be called, and what each side seeks to prove

Opening statements.

Explanation:

Opening statements, like the name suggests, are the starting statements that narrate the events of the case and what's involved. The prosecutor and the defense team will both present their opening statements, though the defense team is not normally required to do so.

During a trial, these opening statements by both parties will provide the jury and the others present in court the outline of the major events, objectives of their teams in the case. This will provide them the time to present the evidence, the witnesses t be called, and the objectives of the parties in each trying to prove their case.

Thus, the correct answer is opening statements.