Question

Gases can be compressed, but liquids cannot.
Which statement explains this difference?
A Each molecule in a gas is more compressible than each molecule in a liquid.
B Molecules in a gas are further apart than molecules in a liquid.
C Molecules in a gas attract each other more strongly than molecules in a liquid.
D Molecules in a gas move more slowly than molecules in a liquid.

Answer 1

In contrast, the molecules in liquids are very close together, with essentially no empty space between them. As in gases, however, the molecules in liquids are in constant motion, and their kinetic energy (and hence their speed) depends on their temperature.

C

Answer 2

Actually liquids and solids can be compressed its just that the effect is so small in comparison to that in gases that it is considered incompressible.

Now liquids and solids have an inter-atomic relationship that determines their structure. Gases do have something of this relationship (Van der Waals forces) but it is small and most often transitory. The structure of a gas is more determined by how often particles collide than what ever attractions they have between each other.