Duckings are walking in a queue when they are following the mother duck. Joey the duckling is the 6th from the front and 8th from the back (including the mother duck). Some of the ducklings at the back moved away from the queue making Joey the middle duckling in the queue. How many ducklings moved away from the queue? 
选项为:A:$$2$$  B:$$3$$  C:$$4$$  D:$$5$$  E:None of the above.  请回答其中一个选项.