In Mammals, Dosage Compensation Refers to a Mechanism in Which

In mammals, dosage compensation refers to a mechanism in which:

A) the level of expression for a given gene is directly related to the number of copies of the gene.
B) genes in the Y chromosome must be expressed at higher levels than would otherwise be the case because they are not homologous with genes on the X chromosome.
C) genes in the X chromosome must be expressed at lower levels than would otherwise be the case because they are not homologous with genes on the Y chromosome.
D) X chromosome genes are regulated differently in males and females because members of one sex have two X chromosomes, whereas members of the other have only one.
E) None of the answer options is correct.