Final answer:
One physical marker of schizophrenia is ventricular enlargement.
Step-by-step explanation:
c) Ventricular enlargement
One physical marker that might be seen in the brains of people with schizophrenia is ventricular enlargement. Schizophrenia is associated with an increased size of the ventricles in the brain. The ventricles are fluid-filled spaces that help support and protect the brain.
Options a) Enlarged hippocampus, b) Increased gray matter, and d) Normal brain structure are not typically observed in people with schizophrenia. While there may be variations in brain structures and functions in individuals with schizophrenia, ventricular enlargement is one of the more common physical markers seen.