A red kangaroo and a gray kangaroo weigh $$139\textasciitilde\text{kg}$$ altogether. The red kangaroo weighs $$35\textasciitilde\text{kg}$$ less than the gray kangaroo. How much does the gray kangaroo weigh? 
选项为:A:$$104\text{kg}$$  B:$$52\text{kg}$$  C:$$87\text{kg}$$  D:$$96\text{kg}$$  E:$$53\text{kg}$$  请回答其中一个选项.