Final answer:
The nurse concludes that their therapeutic interaction has entered the working stage when the client 1) Identifies goals for the client-nurse interaction.
Step-by-step explanation:
In the context of a nurse-client relationship, the working stage is generally characterized by active involvement and progress towards therapeutic goals. When considering the options presented, identifying goals for the client-nurse interaction is indicative of entering the working stage of a therapeutic relationship. This stage typically involves collaborative goal-setting and problem-solving that are directed at dealing with the issues presented by the client's condition.
Exploring the effect of bipolar behavior on the family can be a part of this work, as might sharing information about family history with bipolar disorder. However, these actions do not, in isolation, indicate the therapeutic interaction has moved to the working stage. Expressing ambivalence about meeting with the nurse usually occurs earlier in the relationship, when rapport is being established, not in the working stage.
Hence, the correct answer is Option 1.