Tightly curled hair is caused by a dominant autosomal gene in humans. This trait is rare among northern Europeans. If a curly-haired northern European marries a person with straight hair, what phenotypes (and in what proportions) are expected in the offspring?

a.1/2 curly (because the curly-haired individgal is most likely heterozygous) 1/2 straight hair
b.1/2 curly (because the curly-haired individual is most likely homozygous), 1 /2 straight hair
c. all curly (because the curly-haired individual is most likely heterozygous)
d.3/4 curly (because the curly-haired individual is most likely heterozygous), 1/4 straight hair