A pencil is one dollar, and a pencil box is two dollars more expensive than a pencil. Jimmy has seven dollars and bought a pencil box. How many pencils can Jimmy buy？(adapted from $$2009$$ Math kangaroo Problems, Level $$1-2$$, Question \#$$6$$) 
选项为:A:$$8$$  B:$$6$$  C:$$1$$  D:$$2$$  E:$$4$$  请回答其中一个选项.