The nurse working with a teen, who has a history of being moody and withdrawn, will make the establishment of a therapeutic alliance a priority because:

The correct answer is C because establishing acceptance and trust conveys feelings of security to the client, which is crucial in building a therapeutic alliance. This is important with a moody and withdrawn teen as it helps create a safe space for the client to open up and express their emotions. Building trust and acceptance fosters a supportive environment, enabling the nurse to effectively address the client's needs. Choices A and B focus more on the client's expression of feelings and activities as outlets for tension, but do not address the fundamental aspect of trust and security in the therapeutic relationship. Choice D is incorrect as focusing on behaviors alone does not necessarily increase self-esteem without the foundation of trust and acceptance.