Why is it possible for a liquid to take the shape of its container?

a.
molecules of a liquid don’t move at all.

b.
molecules in any liquid are very far apart.

c.
all the particles in a liquid are round and smooth.

d.
molecules of a liquid easily slide around each other.

The correct option is D.
Because liquids flow, they can assume the shape of any container in which they are pour. Liquids are able to flow because the particles in liquid move around one another easily. When a liquid is pour inside a container, the container limit the fluidity of the liquid particles, so the liquid take up the shape of the container.