One aspect of family environment that has been found to be important in schizophrenia is a. the level of expressed emotion b. the level of parental grief over their child's illness c. if the mother is cold and aloof d. if lots of double blind communications are used

a. the level of expressed emotion            

Explanation:

In abnormal psychology, Schizophrenia is referred to as one of the serious mental illnesses that are being distinguished as an individual having illogical or incoherent thoughts, hallucinations or delusions (hearing voices or imagining things that are not physically present), bizarre speech or behavior. However, it generally arises at the "early adulthood" period of an individual's life.

Causes: Genetic factors, physical factors, environmental factors, and psychological factors, etc.

A few people might get prone to 'schizophrenia' and therefore an emotional or stressful life event is responsible for triggering a "psychotic episode".

Option A is correct in the question above.

Life liberty and the pursuit of happiness are what he lists as "natural rights". I think he meant that every human should be born with these rights and they therefore "natural". He meant that these rights come with being human, and do not have to be earned.