Recent Biological Theories Emphasize That the Brain Develops at a Different

Recent biological theories emphasize that the brain develops at a different time than the genitals and can thus be predisposed to identify with the gender opposite to that associated with the genitals. What is the primary flaw in these theories?

A) The assumption that gender identity can differ from biological sex
B) The belief that the brain develops at a different time than the genitals
C) The assumption that gender is binary
D) The belief that the time of development of the genitals has any effect on the brain