How Do the Constituents of Liquid Medium Differ from Solid

How do the constituents of liquid medium differ from solid, gel-like medium?

A) Liquid medium contains agar, a polysaccharide extracted from algae.
B) Solid medium contains agar, a polysaccharide extracted from algae.
C) Solid medium contains agar, a complex lipid extracted from bacterial membranes.
D) Liquid medium contains more salts, which lower the freezing point.
E) Solid medium contains more fatty acids, which raise the melting point.