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 be the reason glass has become scarce and the process of making glass making be lost to the world ?
Answer: The Barcid King ordered his people , at no cost , would glass be given to outsiders after the war .The King would decide who would get glass .The King wanted to be paid before giving away glass .None of the above choices .