Given below are two statements: 
Statement I: The overall increase in volume of thoracic cavity causes a similar increase in pulmonary volume.
Statement II: Muscles of abdomen cannot alter thoracic and pulmonary volume.
In the light of the above statements, choose the correct answer from the options given below 

Statement I is true but Statement II is false.

The overall increase in volume of thoracic cavity causes a similar increase in pulmonary volume.

During forced exhalation, contraction of the abdominal muscles can help push the diaphragm upwards, further reducing thoracic cavity volume and aiding in expelling air from the lungs.