C. The counsellor creates a climate conducive to self-exploration.

C. The counsellor creates a climate conducive to self-exploration.

In Person-Centered therapy, the counsellor's primary role is to establish a therapeutic environment characterized by empathy, unconditional positive regard, and congruence. This environment allows the client to feel safe, accepted, and understood, which is conducive to self-exploration and personal growth. While clients often enter therapy in a state of incongruence (a discrepancy between their self-concept and their experience), the core experience provided by the therapy itself is the supportive climate for self-exploration.

The final answer is $\text{C}$