Final answer:
Individuals with a severed corpus callosum cannot verbally identify objects shown only to the left visual field because the right hemisphere, which receives the information, cannot communicate with the speech center in the left hemisphere.
Step-by-step explanation:
People who have had their corpus callosum severed for medical reasons, such as to treat severe epilepsy, experience a condition known as split-brain. This condition offers insight into the unique functions and communication between the two hemispheres of the brain. When an image or object is shown only to the left visual field, these individuals may not be able to verbally identify or acknowledge the object because the information is processed in the right hemisphere, which is generally nonverbal. The speech center, which is typically located in the left hemisphere, does not receive the visual information due to the severed corpus callosum. Therefore, the answer is C. only the left visual field, since they would not be able to verbalize what they've seen specifically in the left visual field due to lack of communication between hemispheres.