Prosopagnosia, or face blindness, was lately given a boost in long-overdue recognition as a genetic disorder when the distinguished professor of neurology and best-selling author Oliver Sacks described his own affliction with the disease. Like other prosopagnosiacs, Sacks Line has a fundamental inability to recognize faces, and not just the faces of random strangers or 5 people he met for the first time last week. One index to the profundity of Sacks's problem is reflected in a study that found that prosopagnosiacs who looked at photos of their own family members were unable to recognize $\(30 \%\)$ of the faces. Sacks himself admits that he often does not recognize a person whom he has met just five minutes before.

The passage achieves all of the following purposes EXCEPT:

A. explain why prosopagnosia was given recognition as a genetic disorder.
B. tell or imply how prosopagnosia manifests itself.
C. cite research that helps define the challenges faced by prosopagnosiacs.
D. personalize and humanize the disorder known as prosopagnosia.
E. imply the severity of the challenges faced by prosopagnosiacs.