【正确答案】 B

【答案解析】The incidence of ovarian cancer increases in women who have never been pregnant, are infertile, or have menstrual irregularities and after menopause. Other risk factors include a personal or family history of ovarian, breast, bowel, or endometrial cancer. The risk of ovarian cancer is reduced in women who have taken oral contraceptives, have had multiple births, or have had a first child at a young age.