15. Research on conditions that are relatively new to human populations such as myopia, breast cancer, and obesity support the conclusion that_________. (A)human populations have accumulated a number of mutations that have become fixed by genetic drift (B)the changes in human lifestyle account for all of the increase in frequencies of these conditions (C)these conditions are indeed "diseases of civilization" and are likely caused by the interaction between genes (genetic susceptibility) and novel environments (D) these human conditions are mere artifacts of the way in which they have been evaluated