Answer:
The correct answer is option a. "over five times as many diagnostic categories".
Step-by-step explanation:
The original Diagnostic and Statistical Manual of Mental Disorders (DSM) of the 1950s was an historical effort to classify the various mental conditions that people suffer from. The DSM-5 of 2013 is a much more improved manual, including over five times as many diagnostic categories in comparison to the original of the 1950s. These categories include anxiety disorders, depressive disorders, eating disorders, personality disorders, among others.