Mary and Jimmy are eating ice cream of the same size. Jimmy eats ice cream twice as fast as Mary. Mary finishes in four minutes. How many minutes Jimmy need?~(adapted from $$2008$$ Math kangaroo Problems, Level $$1-2$$, Question \#$$6$$) 
选项为:A:$$2$$  B:$$6$$  C:$$3$$  D:$$4$$  E:$$5$$  请回答其中一个选项.