Teacher:In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".
Teacher: Now, understand the problem? Solve this instance: [header] How to perform the heimlich maneuver [title] Determine if the person is truly choking. [step] A choking victim will often have their hands around their throat. If you notice someone making this gesture, look for other choking signals. <sep> (A) Choking with your eyes closed, look elsewhere for a pocket of air. Also note if the person has curled up or has collapsed. (B) Ideally, at this point a choking victim will be coughing by suppressing the flow of blood from their mouth. [substeps] A choking victim may often make these gestures subconsciously, so be sure to look for up-loud or correct signs. (C) You should only perform the heimlich on a choking person. Look for the following : [substeps] Cannot breathe or experiencing loud, difficult breathing cannot speak inability to cough effectively blue or gray color to lips and fingernail beds loss of consciousness [title] Let the person know you're going to perform the heimlich. (D) Common choking signals that indicate someone may be choking include : [substeps] Expanding of the esophagus pulling under their rib cage opening clenching or grinding the back of their jaw opened lips [title] Listen for growling or jaw clenching. [step] Individuals who are choking tend to roar loudly when they are nervous or anxious about something.
Student:
C