Final answer:
Jeremiah Walmer's need for ongoing therapy to manage difficulty in moving extremities and prevent contractures, along with the information provided, suggests that the most likely diagnosis is Cerebral Palsy option (D).
Step-by-step explanation:
The individual described in the question, Jeremiah Walmer, who has difficulty moving his extremities and needs therapy to prevent contractures, appears to have a condition affecting his muscular system. When considering the options provided, Cerebral Palsy option (D) is the most likely diagnosis. Cerebral palsy is typically caused by an injury to the developing brain before, during, or shortly after birth, and affects parts of the brain that control body movements. This can lead to muscle weakness, difficulty walking, and the necessity for ongoing therapy to manage the symptoms and maintain as much mobility as possible. It is more common in people with a low birth weight, which can lead to issues controlling movement, particularly in the extremities.