In Drosophila, Dosage Compensation Is Controlled by the Male-Specific Lethal

In Drosophila, dosage compensation is controlled by the male-specific lethal (MSL) complex consisting of MSL proteins and roX RNAs. Based on what you know about dosage compensation, the role of the MSL complex in males would be to

A) double the level of expression of genes on the X chromosome.
B) increase the level of expression of genes on the X chromosome by 50%.
C) decrease the level of expression of genes on the X chromosome by 50%.
D) decrease the level of expression of genes on the X chromosome by 100%.
E) double the level of expression of genes on the Y chromosome.