At what age range can the term "developmental delay" be used by state and local education agencies?

The term "developmental delay" is recognized as applicable for children from birth up to the age of 9. State and local education agencies often use this term to describe children who exhibit significant delays in their development compared to typical age expectations, particularly in areas such as cognitive, physical, communication, social, and emotional development.

The usage of "developmental delay" is crucial in providing early intervention services, as it allows for identification and support of children who may need additional resources to thrive in educational settings. This early identification is vital to address the unique needs of children before they enter formal schooling, enabling them to catch up with their peers.

In contrast, the other age ranges provided do not fully encompass the scope of when "developmental delay" can be officially designated within the educational framework. The definitions and eligibility for services typically extend until the child reaches 9 years of age, which is why the age range in option C is the most accurate.