What Might Be a Reason for the Adult Denervated Muscle

What might be a reason for the adult denervated muscle to express fetal ACh receptors?

A) The turnover rate of the adult ε subunit can be decreased.
B) The turnover rate of the α subunit can be decreased.
C) The turnover rate of the δ subunit can be increased.
D) The turnover rate of the α subunit can be increased.
E) When all subunits are expressed, it is easier to eliminate unnecessary ones than it is to add necessary ones.