Which of the following best describes varicose veins?
a. veins cannot prevent the backflow of blood.
b. veins lose the ability to transport blood to the heart.
c. veins become used for transporting blood to and from the heart.
d. veins become less efficient at transferring waste to the blood.

The statement that best describes the varicose veins is that they are the veins that will not be able to prevent the back flow of the blood. Thus, the answer is letter A. These veins are gnarled and enlarged. For others, having varicose veins are just cosmetic concerns. However, for some thisese may cause other serious problems.