Final answer:
The most used classification system by mental health professionals in the USA is the Diagnostic and Statistical Manual of Mental Disorders (DSM-5), published by the American Psychiatric Association. The correct answer is option: d) diagnostic and statistical manual of mental disorders.
Step-by-step explanation:
The classification system used by most mental health professionals in the United States of America is the Diagnostic and Statistical Manual of Mental Disorders (DSM). Currently, the fifth edition, known as DSM-5, is the standard for diagnosing mental health conditions and is published by the American Psychiatric Association.
The DSM is crucial for mental health professionals as it provides a common language and standard criteria for the classification of mental disorders, which assists in ensuring that diagnoses are consistent and accurate across the board.