During the Evolution of the Human Y Chromosome, All of the Following

During the evolution of the human Y chromosome, all of the following are assumed to occur EXCEPT:

A) the original chromosome was an autosome that eventually evolved into the Y chromosome.
B) one of the early events in the evolution of the Y chromosome was the acquisition or evolution of a gene somewhat similar to the current human SRY gene.
C) many of the genes on the original ancestral chromosome suffered mutations and became inactive during the evolution of the Y chromosome.
D) many of the genes on the early X chromosome that were responsible for critical cellular functions got moved to the evolving Y chromosome.
E) several palindromic regions evolved or were acquired and are now present on the Y chromosome.