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.

increased stability in the completion of fluorine's outer shell.

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.