A recipe that makes~$5$~servings of hot chocolate requires~$2$~squares of chocolate,~$\dfrac{1}{4}$~cup sugar,~$1$~cup water and~$4$~cups milk. Jordan has~$5$~squares of chocolate,~$2$~cups of sugar, lots of water, and~$7$~cups of milk. If he maintains the same ratio of ingredients, what is the greatest number of servings of hot chocolate he can make? 
选项为:A:$5\dfrac{1}{8}$  B:$6\dfrac{1}{4}$  C:$7\dfrac{1}{2}$  D:$8\dfrac{3}{4}$  E:$9\dfrac{7}{8}$  请回答其中一个选项.