The answer is one and four.
1 and 4 are generally facts about his life and what he did.
2 and 3 are minor details rather than central ideas.
If i remember right, They thought Snowball was hiding on one of the other farms.
Clara and Obi go to a doctor who says he cannot perform an abortion, and it is not until they reach a second doctor who says that he will perform the abortion (only for cash) that they are able to arrange everything.