Answer:
The differentiating factor to decide which answer is correct is: Can anyone realize that the claim is true or false just by remembering something pretty general, objective and obvious to not dig for an answer.
Explanation:
1.- Common knowledge. George Washington was the first president of the United States.
2.- Needs documentation. Hemingway's novel The Old Man and the Sea, won a Nobel Prize in 1954.
3.- Needs documentation. The theme of revenge in Shakespeare's Hamlet is dominant in the play.
4.- Common knowledge. The earth revolves around the sun.
5.- Needs documentation. a quotation from a speech by a famous person
6.- Needs documentation. a description of the construction methods for building the pyramids