What Does Contraction of the Diaphragm Cause

What does contraction of the diaphragm cause?

A) decrease in the volume of the thoracic cavity and, therefore, a decrease in atmospheric pressure
B) decrease in the volume of the thoracic cavity and, therefore, a decrease in intra -alveolar pressure
C) increase in the volume of the thoracic cavity and, therefore, an increase in intra -alveolar pressure
D) decrease in the volume of the thoracic cavity and, therefore, an increase in intra -alveolar pressure
E) increase in the volume of the thoracic cavity and, therefore, a decrease in intra -alveolar pressure