In reality , it was sand . Sand used to make the finest glass . After the war , the Barcid king had ordered that no glass was to be given to outsiders at any cost . Thus , over the years , glass had become scarce and the process of glass making lost to the world .

Question: What may happen if the King does n't allow outsiders to have glass after the war .
Answer: Glass will become scarce to everyoneGlass would be around in some places .None of the above choices .Everyone making glass will be forgotten .