Which of these is a difference between veins and arteries?
A
Arteries carry blood, and veins do not.
B
Veins carry oxygen, and arteries do not.
C
Arteries flow toward the heart, and veins flow away from the heart.
D
Veins flow toward the heart, and arteries flow away from the heart.
C
Arteries flow toward the heart, and veins flow away from the heart.