With Regard to Gender Differences and Specific Learning Disorders (SLD)

With regard to gender differences and specific learning disorders (SLD) :

A) Between 60% and 80% of children referred for an evaluation of SLD are boys
B) Epidemiological studies find that somewhat more girls meet diagnostic criteria for specific learning disorders than boys
C) There may be a referral bias, where teachers are more likely to refer girls for help with specific learning disorders than boys
D) Both b and c are correct