In Carl\textquotesingle s pencil case there are nine pencils. At least one of the pencils is blue. In any group of four pencils, at least two have the same colour. In any group of five pencils, at most three have the same colour. How many pencils are blue? 
选项为:A:$$1$$  B:$$2$$  C:$$3$$  D:$$4$$  E:More information needed  请回答其中一个选项.