The figure given below shows a small part of human lung where exchange of gases takes place. In which one of the option given below, the one part A, B, C or D is correctly identified along with its functions

Options

A. B : Red blood cell - transport of `CO_(2)` mainly
B. C : Arterial capillary - passes oxygen to tissues
C. A : alveolar cavity - main site of exchange of respiratory gases
D. D : Capillary wall - exchange of `O_(2) " and " CO_(2)` takes place here

Answer

c

Explanation

A is the alveolar cavity which is the main site of exchange of respiratory gases.