Answer:
A. Napoleon forces Snowball to leave the farm by expulsion.
C. Napoleon steals Snowball’s plans and claims them as his own.
D. Napoleon claims to have been an advocate of the windmill.
Explanation:
"Napoleon is motivated by a desire for control over the farm."
Snowball was competition for his desire for control. He had to remove Snowball for his ideas to be carried out.
A is correct because this shows that Napoleon doesn't want anyone working against him.
C is correct because this shows that he wants to be known for everything on the farm. He wants the farm to be synonymous with his name.
D is correct because this also shows that he wants to be known for more things on the farm. He also wants the windmill to be synonymous with his name.