What is the main difference between the gas water vapor and the liquid water?

Question

A.
Liquid water is made out of different molecules than water vapor is.
B.
The molecules of water vapor are much smaller than those of liquid water.
C.
Liquid water has much less space in between its molecules than water vapor does.
D.
The molecules of water vapor pull on each other much more strongly than the molecules of liquid water do.

Answer 1

The main difference between gas water vapor and liquid water is:

C. Liquid water has much less space in between its molecules than water vapor does.

In the gaseous state (water vapor), the molecules are more spread out and have much more space between them, while in the liquid state, the molecules are closer together, allowing for stronger intermolecular forces and less space in between them.