Final answer:
The nurse should first assess the patient's perception of what it means to have diabetes mellitus.
Step-by-step explanation:
The nurse should take action b and assess the patient's perception of what it means to have diabetes mellitus first.
Assessing the patient's perception of having diabetes is important because it helps the nurse understand the patient's knowledge, beliefs, and attitudes towards diabetes. This information will guide the nurse in tailoring the diabetes education program to meet the patient's specific needs and address any misconceptions or concerns the patient may have.
By understanding the patient's perception, the nurse can provide relevant information and support to help the patient better manage their diabetes and make necessary lifestyle changes.