Final answer:
The best example of the implementation step of the nursing process is arranging for the client to receive pain medication 30 minutes before ambulation.
Step-by-step explanation:
The best example of the implementation step of the nursing process among the given options is number 3: arranging for the client to receive pain medication 30 minutes before his ordered ambulation.
This is an example of implementation because it involves taking action to carry out the plan of care. By arranging for the client to receive pain medication before ambulation, the nurse is implementing a specific intervention to address the client's pain and facilitate his ability to walk.
This intervention demonstrates the implementation step of the nursing process because it involves putting the plan into action and directly providing the care and interventions necessary to meet the client's needs.