A dog breeder wishes to develop a breed that does not bark. She starts witha diverse mixture of dogs. Generation after generation, she allows only the quietest dogs to breed. After 30 years of work she has a new breed of dog with interesting traits, but on average, the dogs still bark at about the same rate as other dog breeds. Which of the following would be a logical explanation for her failure?
A) There is no variation for the trait (barking)
B) The tendency to bark is not a heritable trait.
C) The selection was artificial, not natural, so it did not produce evolutionary change
D) There was no selection (differential reproductive success) related to barking behavior
E) All of the above.