anatomy of esophagus

Q Which of the following is true about anatomy of esophagus?
A. Oesophageal hiatus is superior to aortic hiatus
B. Thoracic duct crosses esophagus at T3-T4level at the level of azygos vein arch
C. Laimer triangle is superior to the Killians triangle

D. In the mediastinum right vagus runs anteriorly and left vagus runs posteriorly