The correct option is A Colour blindness
In the pedigree, an affected male gives rise to affected son and daugter, so, the inheritance is not sex-limked. If the trait was recessive, mother should be a carrier. Since pedigree doesnt say the mother to be acrrier, we can safely assume it is an autosomal dominant disease.
Colour blindness is an X - linked recessive and all other options are autosomal dominant disorders.