Final answer:
Black women may be less likely to stop bleeding after using IUDs due to increased risk of uterine fibroids, which cause heavy menstrual bleeding and are not prevented by IUDs.
Step-by-step explanation:
The question is aimed at understanding why Black women may experience continuous bleeding after the use of Intrauterine Devices (IUDs). The correct answer is b. Increased risk of uterine fibroids. Research has shown that Black women are disproportionately affected by uterine fibroids, which are non-cancerous tumors of the uterus. These fibroids can cause various symptoms, including heavy menstrual bleeding, which may continue even after the insertion of an IUD. Hormonal IUDs are designed to prevent pregnancy by thickening cervical mucus and potentially interfering with ovulation, but they do not prevent the bleeding associated with fibroids.