39. _________ For instance, it is producing a new understanding of how cancer develops. It is helping researchers to design more effective and less harmful drugs. It is providing precise information on who is most vulnerable to what kind of illness. Perhaps most importantly, it is bringing new insights into the function of regulatory genes which affect all human growth and development, from birth to death.
(A) Genetics is progressing so rapidly that it is transforming medical research.
(B) Genetics discovers the effective treatment for cancer.
(C) Genetics is creating new facts about the human body.
(D) Genetics focuses on the study of regulatory genes which affect birth and death.
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