The answer would be transform boundaries where crust is neither created or destroyed and an example is movement on the San Andreas Fault which is primarily lateral movement on or close to the surface and no melting of rock is involved.
It would be A, lack of moons. In fact, Jovians are noted for their astounding number of moons. Saturn, for example, has 62 moons.
Deep water is denser than shallow water. The water molecules are packed together more tightly because of the weight of water above pushing down. Hopefully this helps
