If a Person Has a Large Piece of Food Lodged

If a person has a large piece of food lodged in their pharynx blocking the glottis,what can be done to ensure that they can still breathe?

A) Push your fingers down their throat in an attempt to grab the piece of food.
B) Have the person eat a large piece of bread to see if they can push the blocked food down into the esophagus.
C) Tell them to breathe through their nose so that the air will go around the blockage.
D) Make a small incision in the trachea,just beneath the larynx.
E) Give them an oxygen mask that has a high concentration of pure oxygen.