They sailed from England in 1620.
Answer:
B. They believed the British would prevent further movement westward by the Americans
Well, depends on what battle this question is talking of.
I'm going to assume you're talking about the famed "Battle of Saratoga" and specifically the "Battle of Bemis Heights".
That specific battle cost that dude 600 soldiers.
If you're talking about "Freeman's Farm" then that cost him around 600 guys as well.