The heimlich maneuver (also called abdominal thrusts) is used primarily a to save a drowning victim. b when a person is not breathing. c to revive a patient who lacks a heartbeat. d when a foreign body airway obstruction occurs.

The correct answer is D. When a foreign body airway obstruction occurs.

Explanation:

The Helmich maneuver is a first aid maneuver used when someone is chocking, this means, food or an object (foreign body) is obstructing the throat or airways and due to this, the person has difficulties to breathe normally. In this way, by performing abdominal thrusts (Heimlich maneuver) the foreign object can be expelled of the body, and the individual will be able to breathe normally. According to this, the situation in which this maneuver is primarily used is "When a foreign body airway obstruction occurs".

f=gm1m2/d^2 it d

f is force g is gravitaiton constant, m1 is mass of first object, m2 is mass of second object. d is distance between two object