A Mutation That Renders the MHC Class II Molecule DM

A mutation that renders the MHC class II molecule DM nonfunctional would likely lead to

A) cells with no class II MHC.
B) cells with no DO.
C) cells with class II MHC only bound with CLIP.
D) cells with class II MHC bound with a variety of self-antigens.
E) a deficiency in CD8⁺ T cells.