Kody, a Boy, and Shakira, a Girl, Are Brother and Sister

Kody, a boy, and Shakira, a girl, are brother and sister. They both inherit the same recessive allele for Trait T on their X chromosome from their mother. What is the relative likelihood of Kody and Shakira expressing Trait T?

A) Both Kody and Skakira are likely to express Trait T.
B) Kody is more likely than is Shakira to express Trait T.
C) Shakira is more likely than is Kody to express Trait T.
D) Neither Kody nor Shakira is likely to express Trait T.