What Is the Most Likely Explanation for the Occurrence of an X-Linked

Multiple Choice

What is the most likely explanation for the occurrence of an X-linked genetic disorder in the boy at the bottom of the pedigree shown?

A) The boy inherited this allele from his father only.
B) The boy inherited this allele from his mother only.
C) The boy inherited the kind of allele that skips every other generation.
D) The boy has a new mutation for the disorder.