Final answer:
The given statement uses direct characterization by explicitly stating that Nina is annoyed, rather than requiring the reader to infer this from her behavior or interactions with others.
Step-by-step explanation:
The statement 'Nina was so annoyed at her little brother for bothering her' represents direct characterization. In literature, direct characterization occurs when the author explicitly describes a character's traits, feelings, or motivations without leaving room for interpretation. In contrast, indirect characterization reveals a character's personality through their actions, thoughts, dialogues, and interactions with other characters, requiring the reader to infer these traits.
In this particular case, since the author is directly telling the reader that Nina is annoyed, rather than showing it through her actions or dialogue, it's an example of direct characterization.