Final answer:
The OTR applied the principle of autonomy by discussing the intervention plan with the client and allowing them to make the final decision regarding the chosen interventions.
Step-by-step explanation:
The OTR most likely applied the principle of autonomy during the session with the client. The principle of autonomy states that patients have the right to self-determination and to make their own decisions regarding their health care. Since the OTR discussed the intervention plan and allowed the client to make the final decision regarding the interventions that will be included, this upholds the client's ability to exercise their autonomy in their care. This consideration ensures that patients are entering into treatment with informed consent and are not exploited, thus respecting their right to make decisions about their own health care treatments.