A person met with an accident and died instantaneously without any injury to the heart, brain, stomach, or kidney, which one of the following must be the reason?

Concept: The diaphragm is a delicate sheet-like structure that helps to protect the thoracic chamber and also separates it from the abdomen. A ruptured diaphragm leads to pain and the passage of organs from the abdomen towards the lungs and causes a decrease in lung surface area. The decrease in lung surface area leads to difficulty in breathing, if the rupture is not serious then it surgically gets treated but a major rupture in the diaphragm causes the improper supply of oxygen due to difficulty in the breathing process and ultimately the person dies.

Hence, the correct answer is option A.