Final answer:
The subject of this question is Arts and it pertains to the psychological aspects of performing arts.
Step-by-step explanation:
The subject of this question is Arts. The question is about how Sue's nervousness was influenced by seeing her mom, an actress, and her psychology teacher in the audience during the school play. The mention of concepts that would help her make sense of her thoughts, feelings, and surroundings implies that the question relates to the psychological aspects of performing arts.
Sue can gain a better understanding of her thoughts, feelings, and environment by remembering these psychology concepts. She can use this knowledge to control her anxiety and perform with greater confidence in the school play.