Regarding Expiration - choose the incorrect statement :

Question

( a ) Relaxation of the diaphragm and the inter-costal muscles returns the diaphragm and sternum to their normal positions
( b ) Reduced pulmonary volume. This leads to an increase in intra-pulmonary pressure to slightly above the atmospheric pressure
( c ) Relaxation of the diaphragm and the inter-costal muscles increases the thoracic volume
( d ) Relaxation of the diaphragm and the inter-costal muscles reduces the pulmonary volume