The Incidence of Breast Cancer Varies Depending on a Woman's

The incidence of breast cancer varies depending on a woman's age. The National Cancer Institute gives the following probabilities for a randomly chosen woman in her 40s who takes a mammography to screen for breast cancer:
The specificity of a diagnosis test is its ability to appropriately give a negative result when a person tested doesn't have the disease, P(Negative test | No cancer) . What is the specificity of mammography?

A) 0.90
B) 0.89
C) 0.80
D) 0.20