Chloe has＄$$7$$. She is going to buy $$6$$ pens, and each costs $90$ cents. She also buys a certain number of pencils, and each costs $$50$$ cents. How many pencils at most can she buy? (Adapted from 2007 Math Kangaroo Problem, Level 3-4, Question \#4) 
选项为:A:$$5$$  B:$$4$$  C:$$3$$  D:$$2$$  E:$$1$$  请回答其中一个选项.