Final answer:
The nurse needs additional training on effective delegation when they perform tasks beyond their scope of practice, such as making medical decisions.
Step-by-step explanation:
The situation that indicates the nurse needs additional training on effective delegation is option B. The office nurse calling in orders for admission on a client following a surgical complication. Delegation involves the process of assigning tasks to others while still maintaining accountability for the outcomes. However, calling in orders for admission involves making medical decisions, which is beyond the scope of practice for an office nurse. This indicates a lack of understanding of delegation principles and the need for additional training.