Final answer:
A key component of autonomous motivation is that the client is the expert on him- or herself.
Step-by-step explanation:
In the context of autonomous motivation, a key component is that the client is the expert on him- or herself. This means that the individual has a good understanding of their own needs, preferences, and goals. By recognizing their own expertise, the client is more likely to take ownership of their behavior change process, leading to greater motivation and success.