A conscious adult is clutching their throat and unable to speak or cough. The trained first response is:

Explanation

For a conscious adult choking on a foreign object (universal sign: hands at throat, unable to speak/cough/breathe), the standard intervention is abdominal thrusts (Heimlich maneuver) — fist placed just above the navel and below the rib cage, sharp inward and upward thrusts. If the person becomes unresponsive, lower them to the ground and begin CPR, checking the mouth for the object before each set of breaths. Blind finger sweeps (d) can push objects deeper. Water (c) can aspirate into the lungs. Lying flat first (a) loses gravity assistance.