Question

arteries and veins usually carry what colors of blood?
both carry blue blood.
both carry red blood.
arteries carry red blood, while veins carry blue blood.
arteries carry blue blood, while veins carry red blood.

Explanation:

Arteries generally carry oxygen - rich blood which is bright red, and veins carry oxygen - depleted blood which is still red (but darker red, not blue). Blood is always red due to the presence of hemoglobin.

Answer:

B. Both carry red blood.