The relationship in the first pair, MELT : LIQUID, is that melting is the process that causes something to turn into a liquid state. It is a "Process : Resulting State" analogy.
We need to apply the same relationship to the second pair, FREEZE : ?.
Freezing is the process that causes something to turn into a SOLID state.
Let's analyze the options:
\[\begin{array}{rl} \bullet & \text{(A) SOLID: This is the resulting state from the process of freezing. This fits the analogy.} \\ \bullet & \text{(B) PUSH: This is unrelated.} \\ \bullet & \text{(C) ICE: Ice is an example of a solid, but SOLID is the general state, just as LIQUID is a general state.} \\ \bullet & \text{(D) CONDENSE: This is a different change of state (gas to liquid).} \\ \end{array}\]
The best fit for the analogy is SOLID.