There was a $15$-meter long corridor in the school. The teacher asked Jack to put a flowerpot on the corridor every three meters. How many flowerpots did Mike put?~(adapted from $$2008$$ Math kangaroo Problems, Level $$1-2$$, Question \#$$7$$) 
选项为:A:$$4$$  B:$$5$$  C:$$7$$  D:$$6$$  E:$$8$$  请回答其中一个选项.