Which of the Following Statements Concerning B Cell Receptors (BCRs)

Which of the following statements concerning B cell receptors (BCRs) is FALSE?

A) They are bound to the surface of B lymphocytes and have two antigen- binding sites.
B) They are complementary in shape to a specific antigenic determinant that they may or may not encounter.
C) Scientists estimate that each person forms at least 1011 different types of B lymphocytes with distinct BCRs.
D) They are formed in response to an encounter with an antigen.
E) Each B lymphocyte is randomly generated with antibody variable regions that determine its BCR.