In the animal school, some sheep are taking lessons. The teacher cow finds out that the sheep have $$24$$ legs altogether. How many sheep are there? (Adapted from 2012 Math Kangaroo Problem, Level 3-4, Question \#14) 
选项为:A:$$6$$  B:$$5$$  C:$$4$$  D:$$3$$  E:$$2$$  请回答其中一个选项.