The selective/clonal selection theory of immune response ultimately proved to be correct, but

Question

the instructional theory, while incorrect, seemed logical because

A) if one gene produces one antibody, then it didn't seem that humans had enough DNA to
produce thousands of possible antibodies.
B) it seemed reasonable that a cell would be "instructed" to react to a specific antigen only
when it was encountered.
C) the immune system was shown to be capable of such a wide variety of substances that it
seemed impossible that such a high number of different possibilities would be preformed
without any prior exposure.
D) if thousands of preformed antibodies were present to antigens that are never encountered,
this is excessively wasteful and poor use of the body's resources.
E) All of the above.

Answer 1

E