As an Adaptive Immune Response Progresses,the Production of Variant Antibodies

Multiple Choice

As an adaptive immune response progresses,the production of variant antibodies that compete more effectively for antigen occurs,and B cells producing these antibodies are preferentially selected on the basis of their improved binding to antigen.This phenomenon is referred to as _______.

A) isotype switching
B) neutralization
C) allelic exclusion
D) affinity maturation
E) somatic rearrangement.