Answer:

B.  The nurses on the unit report how the new standards have affected patient health status and bedside care

Rationale: 

Implementing evidence-based practice into care is one aspect of maintaining current practice standards. The nurse may learn of methods that continually improve patient care and implement them into practice, but she must also evaluate the effectiveness of the new practices. The best method of evaluation would be to ask the providers who use the new standards about their effectiveness.