My tip for a DBQ is to choose one and use it for your three
One, two and four are limitations of psychological experiments.
The family is not very strong at promoting nationalism: for once, there can be family members of other nationalities, which would promote multinationalism! so we can reject a) and c)
now, military and state religion are both found in the other options and we have to choose between school and athletics - and school is more effective! so the correct answer is D.
Answer:
i think it’s d, but i’m not sure.
Explanation: