Final answer:
Late beginning of childbearing is a factor that increases the risk of breast cancer due to the association with higher breast cancer risk in women who have their first child after age 30.
Step-by-step explanation:
The factor identified by the nurse in a client's history that places the client at an increased risk for breast cancer is D. Late beginning of childbearing. Factors such as a family history of breast cancer, particularly with an early age of onset, and certain inherited genetic mutations like BRCA1 and BRCA2 genes greatly increase the risk of breast cancer. However, delayed childbearing can also increase the risk, as having one's first child after age 30 is associated with a higher risk of breast cancer when compared to women who give birth at a younger age.