A nurse is providing teaching to a group of clients about risk factors for ovarian cancer.Which of the following risk factors should the nurse include?

Choice A rationalePostmenopausal estrogen use has been scientifically linked to increased ovarian cancer risk due to hormonal stimulation of epithelial ovarian cells, validated by epidemiological studies.Choice B rationaleHistory of breastfeeding decreases ovarian cancer risk by reducing ovulation frequency, thereby reducing epithelial ovarian cell exposure to hormonal changes, which supports scientific prevention evidence.Choice C rationalePrevious use of oral contraceptives is protective against ovarian cancer by suppressing ovulation and reducing epithelial cell proliferation, contrary to the implication of risk.Choice D rationaleBreast cancer history is associated with ovarian cancer only when linked to BRCA mutations. Independent breast cancer history does not inherently increase ovarian cancer risk.