What elements are involved in hydrogen bonding

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

Which three statements represent the benefits of performing experiments using computer simulations?

Aplanet similar to earth has four moons roughly the same distance away. the moon that will most affect tides on the planet is the one that has the greatest a) mass. b) volume. c) density. d) amount of water.