Who is a Carrier of an X-Linked Trait

Question

Who is a carrier of an X-linked trait?  
A) Homozygous dominant female
B) Heterozygous female
C) Homozygous recessive female
D) Homozygous male
E) Heterozygous male

Accepted Answer

A carrier of an X-linked trait is a heterozygous female, meaning she has one normal allele and one allele for the trait on her X chromosomes but does not express the trait because it is recessive.