Heritability Studies of Learning Disabilities Have Shown Which of the Following

Multiple Choice

Heritability studies of learning disabilities have shown which of the following?

A) Environmental factors are the cause of most learning disabilities.
B) Identical twins are more concordant than fraternal twins for reading disabilities.
C) Both fraternal twins are more likely to have learning disabilities than are both identical twins.
D) Teratogens are the cause of most learning disabilities.