Given below are four statements (i-iv) regarding human blood circulatory system.

I. Arteries are thick-walled and have narrow lumen as compared to veins.

II. Angina is acute chest pain when the blood circulation to the heart is increased.

III. Persons with blood group AB can donate blood to any person with any blood group under ABO system.

IV. Calcium ions play a very important role in blood clotting.

Which two of the above statements are correct?

• A

  I and IV

• B

  I and II

• C

  II and III

• D

  III and IV.