Neptune is one of the outer planets in our solar system. Which BEST explains why Neptune revolves in its orbit instead of moving out into space? A. Gravity pulls Neptune towards the sun.
B. Neptune's orbit is limited in its orbit becasue its so close to Jupiter.
C. Neptune's electromagnetic energy keeps it in orbit around the sun.
D. Other planets have the same mass as Neptune.

A.) Gravity pulls Neptune towards the sun.

Explanation:

Gravity is not the strongest force in nature, actually - it is quite weak in comparison to others.

But it is also the most important force in nature. Gravity is responsible for the formation of the solar system! The sun has more gravity than anything in our solar system! It keeps planets and other small bodies in a continous and elliptical orbit. The same applies to Neptune!

Also, did you know that the mass of the sun makes up 99.8% of ALL the mass in our solar system? That's pretty cool, right?

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.