A Research Scientist Is Comparing Surface Antigens X and Y

A research scientist is comparing surface antigens X and Y that come from 2 different viruses.  He obtains antibodies against antigen X from an animal previously exposed to the virus expressing this antigen.  These antibodies are then attached to assay plates.  Next, a fixed quantity of radiolabeled X antigen is added to the plates.  Unlabeled Y antigens are then added in increasing concentrations to each plate, and the plates are washed to remove unbound antigens.  Radioactivity is plotted as a function of Y antigen concentration, as shown in the graph below. Which of the following best describes the results of this experiment?

A) Antigen X and antigen Y have no epitopes in common
B) Antigen X and antigen Y have the same epitopes
C) Antigen Y shares most of the epitopes of antigen X
D) Antigen Y shares some of the epitopes of antigen X

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