To add additional information, choice b--glass is not really a solid because it does not have the specific lattice pattern that is a characteristic of solids. Such noncrystalline solids have some characteristics of solids and some characteristics of liquids, which are identifiable under the microscope.
In a solid, the atoms are in an organized pattern, a lattice pattern, which causes a solid to keep its shape. In a liquid, the atoms don't have an organized atomic lattice structure, and the atoms move about more freely, albeit microscopically slowly, exhibiting the properties of a liquid. Glass does have properties of a liquid because its atoms can move about but still too slowly to see the shape of the glass change.
There is atomic order in glass of a noncrystalline nature, not structured as a crystalline lattice as found in solids, like salt, for example, in which the atoms form a crystalline pattern. The atoms in glass aare less ordered than those in a solid, but not as disorganized as in a liquid. The term amorphous is used to describe glass. When glass is manufactured, it is cooled and its atomic motion has slowed significantly enough to produce its almost solid state.
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