Which one of the following is a possibility for most of us in regard to breathing by making a concious effort ?

Options

A. One can consciously breathe in and breathe
out by moving the diaphragm alone, without
moving the ribs at all
B. The lungs can be made fully empty by
forcefully breathing out all air from them
C. One can breathe out air totally without oxygen
D. One can breathe out air through eustachian
tubes by closind both the nose and the mouth

Answer

A