The Field of Epigenetics Has Opened the Way for the Development

The field of epigenetics has opened the way for the development of a new class of anticancer drugs ____.

A) that are very similar to many chemotherapy treatments but are much more targeted and effective
B) that stop mutations before they occur in individuals with a predisposition to certain kinds of cancer
C) that increase the level of methylation in cancer cells
D) used specifically to treat breast cancer because the key genes involved in this cancer cannot be epigenetically modified 
E) because of the discovery that epigenetic modification of key genes is important in some cancers and the fact that epigenetic changes are reversible