The esophagus has three areas where it is normally constricted and where cancer is more likely to develop. TWO of these three areas of normal constriction are found at the ___________ and the ____________.
a) Upper esophageal sphincter, Lower esophageal sphincter
b) Pharyngoesophageal junction, Diaphragmatic hiatus
c) Aortic constriction, Diaphragmatic constriction
d) Cardiac sphincter, Pyloric sphincter