Answer:
Action
Step-by-step explanation:
In literature, characterization is the way the
narrator or author lets the reader known the
characters' personality, appearance, values, etc. Characterization can include multiple techniques such as using direct description (direct characterization) or the character's actions, thoughts, words (indirect characterization). In the case presented, one action is being used to show the personality or behavior of Marcie as the narrator describes "Twisting her braid between her fingers, Marcie jumped whenever anyone entered the room" and this suggests Marcia is either excited about people that enter to the room or nervous. Thus, the method of characterization, in this case, is action.