Final answer:
The 17-year-old girl who started having unexplainable neurological symptoms such as motor tics and paralysis is likely facing Conversion Disorder, since the symptoms align with psychological stress rather than a neurological or genetic disorder.
Step-by-step explanation:
The most likely diagnosis for the 17-year-old girl experiencing motor tics, shaking, and paralysis on her right side that cannot be accounted for medically, particularly in the context of stress about upcoming SATs, is D. Conversion Disorder.
Conversion Disorder is a mental condition in which a person has blindness, paralysis, or other nervous system symptoms that cannot be explained by medical evaluation. Symptoms may occur because of emotional distress or psychological conflict and arise suddenly after such stress or conflict.