What are all the sphincters along the gastrointestinal tract?

Overall, there are seven sphincters along the gastrointestinal tract. These sphincters are called the following: upper esophageal sphincter, esophageal sphincter, pyloric sphincter, iliocaecal valve, external sphincter, internal sphincter, and urethral sphincter. So there. The seven sphincters along the gastrointestinal tract. I hope these answers helped you. 

Its either c or d. i would go with d though, because im not sure if its legal in all of the us