Pls tell me the answer

Pls tell me the answer Every 1000 ml of deoxygenated blood delivers approximately how much ml of C02 to the alveoli? 80 ml 400

Dear Student, Every 100ml of deoxygenated blood carries 4ml of carbon dioxide to the alveoli. So, every 1000ml will carry 40 ml of deoxygenated blood. So, correct answer is 40 ml. Regards