Which one of the following statements is correct about the human circulatory system?
(A) Blood transports only oxygen
and not carbon dioxide.
(B) Human heart has five chambers.
(C) Valves ensure that the blood does not
flow backwards.
(D) Both oxygen-rich and oxygen-deficient
blood gets mixed in the heart.

Options

A. Both (I) and (III)
B. Both (I) and (IV)
C. Both (II) and (III)
D. Both (II) and (IV)