Arthur decided to lose weight. On the first month, he lost $2$ kg. He decided that each month he would be losing twice as much kilograms as the month before. How many kilograms did Arthur lose in total in the first three monthes? 
选项为:A:$$2$$  B:$$6$$  C:$$8$$  D:$$12$$  E:$$14$$  请回答其中一个选项.