What type of related services would help improve a student's expressive and receptive speech and language development?

The most appropriate type of related service to enhance a student's expressive and receptive speech and language development is speech therapy. Speech therapy specifically addresses communication challenges, including articulation, language processing, vocabulary development, and social communication skills. Speech-language pathologists (SLPs) work with students to develop their ability to understand and use language effectively, which is crucial for academic success and social interaction.

Occupational therapy, while beneficial for improving fine motor skills and daily living activities, does not focus primarily on speech and language development. Similarly, physical therapy concentrates on improving gross motor skills and physical functioning, making it less relevant for addressing communication needs. Behavioral therapy may help with specific behaviors but is not primarily focused on enhancing speech and language abilities. Therefore, speech therapy is clearly the most effective approach for improving a student's expressive and receptive communication skills.