1. Which of the following is the primary difference between how B cells and T cells recognize antigens? (A) T-cell receptors can bind antigen only after secretion of the T-cell receptor from the surface of the T cell (B) Antibodies can bind only to denatured proteins (C) T-cell receptors can only bind to carbohydrate groups or clusters of amino acids (D) B cells recognize degraded proteins bound to major histocompatibility molecules (E) T cells recognize antigens bound to major histocompatibility molecules.