In sagittal sections through the thorax,
1. the azygos vein is seen entering the superior vena cava superior to the right pulmonary artery and right bronchus
2. the right bronchus and right pulmonary artery are sectioned perpendicular to their axes
3. the pulmonary trunk is seen after the ascending aorta when sectioning from right to left
4. the right ventricle is to the left of the right atrium

a. 1,2 , and 3 are correct
b. 1 and 3 are correct
c. 2 and 4 are correct
d. 4 is the only correct response
e. All responses are correct