Final answer:
The nursing process step being used when a nurse turns a client every two hours according to a plan of care is Implementing. This involves direct patient care and the execution of planned activities.
Step-by-step explanation:
When a nurse turns a client every two hours based on an established plan of care, the part of the nursing process being utilized is C) Implementing. This step follows the initial assessment and the planning stages. During the implementation phase, a nurse puts the established plans into action, which includes direct patient care activities, such as turning a patient to prevent pressure ulcers. Effective implementation requires the nurse to work under the direct supervision of a registered nurse and to focus on providing dialysis treatments as needed, monitoring patient's vital signs, and preparing equipment to ensure procedures are accurate and sterile.