What was the primary ethical concern in the case discussed?

The primary ethical concern revolves around the nature of the relationship between the client and the counselor and the potential for dual relationships. When a counselor and a client develop personal or social relationships, such as planning to carpool, it can create conflicts of interest and undermine the professional boundaries that are crucial for effective therapeutic work. Maintaining clear professional boundaries helps ensure that the therapeutic relationship remains focused on the client's needs, safeguarding against any potential harm or misinterpretation of the counselor's intentions.

In the context provided, planning to carpool could blur these boundaries, introducing complications that may distract from the therapeutic process. The other options, while they might raise relevant points about the treatment dynamics and client motivation, do not primarily address the inherent risk of dual relationships that could jeopardize the therapeutic integrity.