Final answer:
The blood supply to the vagina is provided by the uterine arteries and vaginal arteries, branches of the internal iliac artery. The ovarian arteries supply the ovary, uterine tube, and uterus but not directly the vagina. Thus, the uterine arteries are the correct answer.
Step-by-step explanation:
The blood supply to the vagina is primarily provided through the uterine arteries and the vaginal arteries. Both of these arteries are branches of the internal iliac artery which branches from the common iliac arteries. The internal iliac artery supplies blood to various pelvic structures, including the urinary bladder, walls of the pelvis, external genitalia, and in females, it also provides blood to the uterus and vagina. Additionally, the ovarian arteries, which are branches of the abdominal aorta, supply blood to the ovary, uterine (Fallopian) tube, and uterus, and form an anastomosis with the uterine artery to help supply blood to the uterus. However, they do not directly supply blood to the vagina. Therefore, the correct answer to the question is B) Uterine arteries.