To support a claim, a student should include information that is o entertaining o positive O relevant O unusual

I would say the answer is relevant.

Explanation:

Being entertaining, positive, or unusual doesn't support the claim and can drift the attention to something else. Being relevant keeps it to the point and it would have something to do with the claim which would support it.

on april 6, 1917, the u.s. joined its allies--britain, france, and russia--to fight in world war i. under the command of major general john j. pershing, more than 2 million u.s. soldiers fought on battlefields in france.