This is a compound sentence (A) because after the and you have another complete sentence and you also have a comma, however, don't always rely on the comma.
They ate beans in the brush and Lennie wanted Ketchup on them. This causes George's outburst because Lennie is difficult for him to take care of.
Answer:
No,Students do not their work themselves.
Since it is an attempt to undermine the argument of an opponent, writers and speakers use it to belittle or weaken the opponent's position, to make it vulnerable to an argumentative attack.