A Patient Has a History of Diabetes Mellitus, Myocardial Infarctions

A patient has a history of diabetes mellitus, myocardial infarctions, and hypertension. His HgbA?c level dropped from 7.8% to 6.2% 2 months after he began a walking exercise program. The nurse case manager had provided diabetic education and suggested ways to enhance his cardiac reserve. This is an example of:

A) nursing empowerment.
B) nursing knowledge.
C) patient expertise.
D) patient participation in care.