Which Person Is an Obligate Carrier of an Autosomal-Recessive Single-Gene

Multiple Choice

Which person is an obligate carrier of an autosomal-recessive single-gene trait or disorder without expressing the trait or disorder?

A) The son of a man with classic hemophilia
B) The daughter of a woman with Marfan syndrome
C) The son of a man who expresses a widow's peak hairline
D) The daughter of a woman who expresses attached earlobes