The pedigree chart below shows the inheritance of a sex- linked trait

Why does the male child II-1 not use the disorder?

A. Male children only inherit the X chromosome form their fathers and the trait is carried on the Y

B. Sex linked traits are always inherited from the mother and the mother does not have the trait.

C. The trait is carried on the X chromosomes and the son inherited his Y from his father.

D. A sex-linked trait always skips the second generation.