Abag filled with gas is more effective at preventing injuries in a car accident than a bag filled with water gas particles move freely collisions between gas particles are perfectly elastic gas particles are compressible gas particles have more kinetic energy at the same temperature

The correct answer is option C which is, "gas particles are compressible".

Gas particles are weakly bonded to each other. So there is a large distance between two molecules.

They are in constant motion, bonds between the molecules are constantly breaking and making.

If we exert a force on the gas, the gas will absorb that force by compressing itself. Which is the distance between the molecules will become low.

In case of cars the gas bags are used as the shock absorbers. So the gas is compressed by absorbing shock.

So most relevant statement is option C.

3 hours because it is a decent distance.