Correct Answer: A

Rationale: The correct answer is A because administering a vaccine to a well child is an example of primary prevention, which aims to prevent disease before it occurs by promoting health and wellness. Vaccines help the child develop immunity to specific diseases, thus preventing the occurrence of illness in the future. This intervention aligns with the RN's role in health promotion by addressing the root cause of potential health issues.

Choice B is incorrect as obtaining a blood glucose level on a client with hypoglycemia is more related to secondary prevention, aimed at early detection and treatment of existing health conditions.
Choice C involves educating a patient on wound care, which falls under tertiary prevention, focusing on managing and preventing complications of existing conditions.
Choice D, administering a nebulizer treatment to a client with asthma, is considered secondary prevention, as it aims to manage symptoms and prevent exacerbations of an existing health condition.

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