15. Most hereditary forms of breast and ovarian cancer arise in women who inherit a mutant copy of either the BRCA1 or BRCA2 gene, each of which encodes a protein involved directly in (A) Inhibiting apoptosis. (B) Repairing DNA double-strand breaks. (C) Passing through the G1 restriction point. (D) A spindle assembly checkpoint. (E) Activating Rho proteins to increase cell motility.