Blood vessels that contain valves are:(a) Arteries(b) Veins(c) Capillaries(d) All of the above

The correct answer is: (b) Veins

Explanation:

Blood Vessels Overview:

The circulatory system is composed of three main types of blood vessels: arteries, veins, and capillaries.
Each type of blood vessel has a distinct structure and function.
Arteries:

Arteries carry oxygenated blood away from the heart to various tissues in the body (except for pulmonary arteries, which carry deoxygenated blood to the lungs).
They have thick, muscular walls to withstand high pressure but do not contain valves.
Veins:

Veins return deoxygenated blood back to the heart (except for pulmonary veins, which carry oxygenated blood from the lungs).
They have thinner walls than arteries and contain valves that prevent the backflow of blood, ensuring it moves in one direction toward the heart.
The valves are especially important in the limbs, where blood must travel against gravity.
Capillaries:

Capillaries are tiny blood vessels that connect arteries and veins.
They facilitate the exchange of oxygen, carbon dioxide, nutrients, and waste products between blood and tissues.
Capillaries do not contain valves.
Conclusion:

Since only veins contain valves to aid in the proper flow of blood, the correct answer to the question is (b) Veins.