CD8 Is a Protein That Functions as a Coreceptor for a Subset

CD8 is a protein that functions as a coreceptor for a subset of T cells and plays a significant role in all of the following EXCEPT:

A) Recognition of peptide antigen bound to class I MHC molecules
B) Maturation of MHC class I-restricted T cells
C) Infection of T cells by human immunodeficiency virus (HIV)
D) Signaling via Lck tyrosine kinase to initiate T cell activation
E) Strengthening the binding of T cells to antigen-presenting cells,albeit with low affinity