Final answer:
The best example of the implementation step of the nursing process is arranging for the client to receive pain medication before ambulation, as it is an action carried out according to the care plan.
Step-by-step explanation:
The nursing intervention that is the best example of the implementation step of the nursing process is arranging for the client to receive pain medication 30 minutes before his ordered ambulation. This action represents the actual carrying out of the planned actions. It is the step where the nurse implements the developed care plan to meet the patient's needs by organizing interventions that will alleviate pain and assist in mobility.