Which of the following statements is true about the specific learning disorders?

A) Specific learning disorder of reading is more common among girls than boys.
B) Specific learning disorder of mathematics is present in about 20 percent of U.S.children.
C) Specific learning disorder of reading affects about 4 percent of children.
D) Specific learning disorder of written expression was renamed as dyslexia in the DSM-5.

According to the DSM-5, specific learning disorder of reading affects about 4 percent of children, making statement C true. Statement A is false; there is no evidence to suggest that specific learning disorder of reading is more common among girls than boys. Statement B is also false; the actual prevalence of specific learning disorder of mathematics is estimated to be lower, at around 5-8 percent. Statement D is partially false; specific learning disorder of written expression was renamed as "specific learning disorder of written expression" in the DSM-5, not dyslexia.