Haldane's Rule States That in Hybrid Offspring, the Sex That

Haldane's rule states that in hybrid offspring, the sex that is heterogametic is the sex observed to be absent, rare, or sterile. Which statement is the most likely explanation for this phenomena?

A) Because the heterogametic sex only has a single copy of each chromosome, effects of a single recessive allele linked to the chromosome will always be expressed and will have a negative effect on that hybrid.
B) Because the heterogametic sex has two copies of each chromosome, effects of a single recessive allele linked to the chromosome will never be expressed and will have a negative effect on that hybrid.
C) Because the homogametic sex only has a single copy of each chromosome, a single recessive allele linked to the chromosome will always be expressed and will have a negative effect on the hybrid parents.
D) Because the heterogametic sex has two copies of each chromosome, a single recessive allele linked to the chromosome will never be expressed and will have a negative effect on the hybrid.