How does making the characters into numbers rather than names affect the drama in Twelve Angry Men

Because jurors are often unnamed in court, the author does not refer to the characters by their given names. The judge, like the author, reads out the jurors' names numerically.

a. by showing how a character reacts to or interacts with his or her   surroundings

explanation:

the setting reveal information about a character by showing how a character reacts to or interacts with his or her   surroundings.