The answer is C. Aquinas believed that all knowledge was based on sensory experience.
According to the excerpt, Platonists or Neo-Platonists, who believed that all knowledge came " entirely from within" of a human being, Aquinas thought the mind is lit by "five windows", meaning that knowledge comes from a person's perception from the outside world, that is, through his or her five senses.
The other options do not imply the main difference between Aquinas and Neo-Platonists, therefore, they are incorrect.
