Answer: A. Her risk is for breast cancer is greater than the general population, but not as great as her sister's risk.
Explanation:
BRCA1 and BRCA2 are specific mutations that have been associated with a greater risk of Breast Cancer. Breast cancer affects 1 in 8 women (12.5% lifetime risk), Familial Breast Cancer accounts for 1 in 5 cases (20%); BRCA 1 and/or BRCA 2, is present in 5-10% of all Breast Cancer Patients. Women that have relatives on 1st degree with Breast Cancer or BRCA1 and BRCA2 mutations have a higher risk of presenting Breast Cancer than the general population.