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

Question

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

Answer 1

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

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

In water vapor (gas), the molecules are widely spaced apart and move freely, while in liquid water, the molecules are much closer together and interact more strongly with each other, which results in a denser structure compared to gas.