The "four cornerstones" of health advocated by the World Health Organization are ()

A. Reasonable diet, moderate exercise, smoking cessation and alcohol restriction, and psychological balance (correct answer)

B. Reasonable diet, moderate exercise, adaptation to the environment and proper tonic.

C psychological balance, moderate exercise, proper tonic, smoking cessation and alcohol restriction.

D. Reasonable diet, smoking cessation and alcohol restriction, psychological balance, and reduced social intercourse.