Choice A rationale:

Using age-appropriate educational materials and visual aids is a sound recommendation to support the development of a child with Down syndrome.

These tools can enhance learning and provide valuable resources for educational activities, which are essential for their cognitive development.

Choice B rationale:

Administering medications and monitoring vital signs regularly may be necessary for managing specific health conditions in a child with Down syndrome, but it is not a general recommendation for supporting their development.

This choice is more medically oriented and does not directly address developmental support.

Choice C rationale:

Encouraging regular exercise and creating a nurturing environment are important recommendations for supporting a child's development, including those with Down syndrome.

Physical activity is beneficial for their overall health, and a nurturing environment can provide emotional support and a conducive atmosphere for growth.

Choice D rationale:

Collaborating with healthcare providers and managing chronic health conditions is certainly important, but it is not the primary recommendation for supporting a child's development.

This choice focuses more on health management rather than developmental support, which is the main concern in this context.