Final answer:
The correct answer for primary prevention activities is 'd. Health education and promotion of wellness,' which encompasses strategies like public health education and vaccinations to prevent diseases before they occur.
Step-by-step explanation:
Primary prevention activities are proactive measures taken to prevent the onset of a disease before it occurs. Among the options provided, the correct answer is 'd. Health education and promotion of wellness. This includes strategies such as public health education, vaccinations, and promoting behavioral changes to prevent diseases. For example, washing our hands can prevent waterborne diseases, and interventions targeting lifestyle changes can have a significant impact on noninfectious disease rates, like cardiovascular diseases and type 2 diabetes.