It is desired to produce tin from its ore, cassiterite, at as low a temperature as poss...

It is desired to produce tin from its ore, cassiterite, at as low a temperature as possible. The ore could be

(a) decomposed by heating, producing tin and oxygen.

(b) heated with hydrogen gas, producing tin and water vapor.

(c) heated with carbon, producing tin and carbon dioxide.

Solely on the basis of thermodynamic principles, which method would you recommend? Show calculations.