I am Confused, can anyone help me please

D

Explanation:

Sound cannot travel through it. Because the molecules of solids, liquids, and gases convey sound waves from one point to another, sound requires a material medium such as solid, liquid, or gas to move. Because there are no molecules in the vacuum that can vibrate and convey sound waves, SOUND CANNOT TRAVEL THROUGH IT.

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.