Which of the following is true regarding mental health and mental illness?

A. Persons who engage in fantasies are not necessarily mentally ill; fantasizing can be a normal coping mechanism. B. Mental health is best defined as a state of emotional, psychological, and social wellness, demonstrated through satisfying relationships, effective coping, a positive self-concept, and emotional stability. C. It is not always easy to determine mental health versus illness, as these concepts exist on a continuum. D. Cultural norms vary; behavior acceptable in one culture may or may not be acceptable in another, so it cannot be considered "always" unacceptable.