Which statements are correct ?
(A) During inspiration intra pulmonary pressure is less than the atmospheric pressure.
(B) During expiration diaphragm contract.
(C) Epiglottis is bony flap which prevent entry of food into the larynx.
(D) During forceful expiration abdominal muscles contract.

Options

A. A, B, C, D are correct
B. A and D are correct
C. B and C are correct
D. A and C are correct

Answer

B