The three ropes are $126$ meters long. The first root is twice as large as the second root, and the second root is twice as large as the third root. How long are the each three ropes? 
选项为:A:$72$, $36$, $18$  B:$72$, $24$, $30$  C:$72$, $44$, $10$  D:$72$, $20$, $34$  E:$72$, $46$, $8$  请回答其中一个选项.