Interferon $\alpha$ Is a Protein That… $\alpha$ ,And Inhibits Translation of MRNAs

Interferon $\alpha$ is a protein that….

A) binds to a cell surface receptor and induces the expression of new cellular genes.
B) binds to a viral peptide and presents it to the cytotoxic T lymphocytes.
C) degrades viral and cellular mRNAs after it has been activated by dsRNA.
D) binds to the surface of a virion and prevents it from attaching to the host cell.
E) phosphorylates proteins,like eIF2 $\alpha$ ,and inhibits translation of mRNAs.