Which of the following best describes primary prevention?

Primary prevention is fundamentally aimed at preventing diseases or health issues before they occur. This involves strategies and actions that are implemented to identify and mitigate risk factors before stress or disease symptoms manifest. By focusing on early intervention, primary prevention can involve activities such as education, vaccination, lifestyle changes, and screening processes that target the underlying causes or risk factors related to health conditions.

The other options do not align with the concept of primary prevention. Addressing symptoms after they appear, strengthening resistance to stressors, or focusing on adjustment after treatment are not proactive measures designed to prevent illness but rather reactive or supportive measures that deal with existing conditions or stressors. Therefore, the core of primary prevention is accurately captured in the choice that highlights the identification of risk factors prior to the onset of stress or disease.