Why is it easier to identify a recessive sex-linked trait in human beings than a recessive autosomal trait?

A) A male needs only to inherit one recessive allele to express an X-linked trait
B) A male needs to inherit two recessive alleles to express an X-linked trait
C) A female only needs to inherit one recessive allele to express an X-linked trait
D) All of these
E) None of these