A
They have thick elastic walls, blood flows under high pressure; collect blood from different organs and bring it back to the heart.
B
They have thin walls with valves inside, blood flows under low pressure and carries blood away from the heart to various organs of the body.
C
They have thick elastic walls, blood flows under low pressure; carry blood from the heart to various organs of the body.
D
They have thick elastic walls without valves inside, blood flows under high pressure and carries blood away from the heart to different parts of the body.
Correct option is D)