The correct answer is (b.) men's. The men's shouts filled the dark night. If you are referring to many male persons, you may use men. You need not any usage of s with men since men is already in a plural form which makes it wrong.
Mr. Frank says this line when they are all fighting.
He is saying that they don't need the Nazis to destroy them. They are destroying themselves by fighting. In this scene, they were fighting over food, which was certainly important -- however, Mr. Frank is saying that the good of all must be considered before individual needs.
Mr. Frank is saying that in order to survive, some sacrifice must be made, and the fighting must be stopped.
Tally marks
Fingers
Etc
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