A 38yearold woman with breast cancer comes for genetic counseling. Her mother died of ovarian cancer at age 35. The woman states that she is fearful her 19yearold daughter will develop cancer and wants to know what testing options are available. Which of the following is the genetic counselor's BEST response?
A. "To accurately determine your daughter's risk for cancer, you must have genetic testing first."
B. "To confirm your mother's diagnosis, we need a copy of her pathology report."
C. "It's understandable to worry about your daughter; we can test her because she is an adult."
D. "My daughter is also at risk for a BRCA2 mutation, and I worry about her too."