An empty jar weighs $375\rm g$. When it is filled with jam it weighs $1.1\rm kg$. How much does the jam weigh? 
选项为:A:$$475$$$\rm g$  B:$$775$$$\rm g$  C:$$575$$$\rm g$  D:$$725$$$\rm g$  E:$$675$$$\rm g$  请回答其中一个选项.