The Lederberg replica plating experiment showed that

Options

A. mutations are actually pre-adaptive and evolution is not directed process, in fact evolution is based on chance events in nature and chance mutation in the organism
B. mutations appear in organism in response to change in the enviorment, conscious reaction desire or use and disuse of organs
C. mutations are random and continuous variations that form the raw material for gradual changes of evolution
D. all of these

Answer

A