What Happened to Mothers of Individuals Who Had an Elevated

Multiple Choice

What happened to mothers of individuals who had an elevated risk of schizophrenia,according to several research studies examining the role of prenatal risk factors for the disease

A)  They took narcotic drugs during the second trimester of their pregnancy. 
B)  They drank heavily during the second trimester of their pregnancy. 
C)  They experienced extreme stress during the second trimester of their pregnancy. 
D)  They experienced high weight gain during pregnancy.