It can be inferred from the passage that many zoologists assume that a large diversity among species of a given class of organisms typically leads to which of the following

A．rejecting an earlier explanation for the longevity of certain brachiopod species
B．reevaluating the implications of uniformity among existing brachiopod species
C．describing the varieties of environmental change to which brachiopods are vulnerable
D．reconciling opposing explanations for brachiopods' lack of evolutionary success

A．They do not believe that illusionist tricks have become trivial.
B．They generally spend little time studying contemporary artists.
C．They have not given enough consideration to how the representation of nature has become commonplace.
D．They generally tend to argue about theories rather than address substantive issues.