According to a Study by Ford and Widiger (1989), What

According to a study by Ford and Widiger (1989) , what is most likely the cause of gender differences observed in the prevalence of many personality disorders?

A) cultural scripts that dictate the type of disordered behaviour appropriate for each gender
B) genetic differences
C) gender-specific, learned behaviour patterns
D) gender bias on the part of the diagnosing clinician