which recent discovery led to a new understanding of how genetic mutations increase the risk of cancer

The discovery of BRCA1 and BRCA2

genes led to a new understanding of how genetic mutations increase the risk of

cancer is. Mutations in the genes BRCA1 (breast

cancer gene 1)

and BRCA2 (breast cancer gene 2) increase a woman's risk of developing breast

or ovarian cancer. BRCA mutations account for about 5% of all breast

cancers and 4%-11% of all ovarian cancers.

The correct answer between all

the choices given is the second choice or letter B.