Answer:
c. Because these nosologies were the first to be atheoretical in their approach, they became a tool for clinicians from a variety of points of view.
Explanation:
Option C is the correct answer which directly refers to DSM-III version.
The DSM-III version took an atheoretical approach to diagnosis. It relied on certain precise descriptions of the disorders as they presented to clinicians. It didn't really rely on psychoanalytic or biological theories of etiology.
This brought detail with which the condition for identifying and locating a disorder were listed. It then made it possible to take study on their reliability and validity.