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 is the reason the Barcid King ordered no glass was to be given to outsiders ?
Answer: He wanted the glass making trade to be rarer and his kingdom would be known for it .He wanted to punish his subjects and make them go glassless .He did n't want anyone to wear glasses .None of the above choices .