Which of the Following Statements About the IgD Made by B

Which of the following statements about the IgD made by B cells of upper respiratory mucosa is not true?

A) These antibodies bind to airborne bacteria such as Haemophilus influenzae.
B) λ light chains are used almost exclusively by these IgD antibodies.
C) Two-thirds of these IgD antibodies possess κ light chains.
D) These IgD antibodies recruit basophils and induce the secretion of antibacterial peptides.