B Cell-Receptors Are Similar to T Cell-Receptors in That ________

B cell-receptors are similar to T cell-receptors in that ________.

A) both receptors are similar in size
B) both receptors have a variable and a constant region
C) both receptors can be secreted in response to antigen
D) both receptors are comprised of four polypeptide chains
E) All of the choices reflect similarities between B cell- and T cell-receptors.