A public health nurse is working with local health care providers on programs to improve the growth and development of children in their community. Which of the following describes a secondary prevention intervention for a developmental delay (ASD)?

A. Early intervention program screening children for developmental delays is a secondary prevention strategy that aims to identify and address delays as early as possible, thus minimizing their impact. B. Environmental policies to decrease air pollution relate to primary prevention, as they aim to prevent health issues before they occur. C. Well-child preventive health visits are part of primary prevention, focusing on maintaining health and preventing illness. D. Free healthy pregnancy classes for expectant parents also represent primary prevention, promoting healthy behaviors to prevent developmental issues.