Concept:The preparation of a salt is guided by the physical and chemical characteristics of that salt, especially its solubility and thermal stability.
Explanation:A soluble salt is often obtained by neutralization and then recovered by crystallization or evaporation.
An insoluble salt is usually produced by precipitation from suitable solutions.
The stability of the salt to heat is another deciding factor.
If the salt is stable to heat, it can be dried or obtained by heating processes.
If the salt decomposes when heated, methods that require heating cannot be used for it.
So the overall method depends on the salt’s solubility and its stability to heat.
From the options listed, stability to heat is the correct determining factor.
Answer:C. stability to heat