Final answer:
Conducting initial evaluations and assessments is not within the scope of practice of the physical therapist assistant.
Step-by-step explanation:
The physical therapist assistant provides support to the physical therapist in their practice. While A) Assisting with therapeutic exercises, B) Educating patients on home exercise programs, and D) Providing modalities under the supervision of a PT are appropriate within the scope of practice for a physical therapist assistant, C) Conducting initial evaluations and assessments is not. Conducting initial evaluations and assessments falls under the scope of practice of the physical therapist, as it requires a higher level of knowledge and expertise.