Why would business leaders get employees to sign/agree to “yellow dog contracts”?

The most remarkable thing about life in the trenches is the incredible number of rats. the whole area is infested with them. no matter what you did, you can't keep them out. they get incredibly fat on all the food they steal from us. they are revolting to look at - some are the size of cats. background information: this is a journal entry from a soldier fighting on the western front. which statement best describes how this soldier felt about the trench rats? a.) he was disgusted by them. b.) he thought they were . c.) he thought they were annoying. d.) he thought they were cute.