1. D
2. B
3. C
I believe this is the answer.
Adding on to the first answer ^^^
Primary sources can also be unreliable as they are biased depending on the source.
If comparing histories of different countries, they tend to describe more victories rather than failures. Also, having a picture as a primary source can be misleading as it can be interpreted in different ways. Sources written in the first person can also have their own biased from the environment the author has lived in.
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The Electoral College is "none of the above", since in fact it is a system in the United States in which electors in every state and Washington DC elect the President.