A cat divides $$24$$ cans of tuna into $$4$$ groups. Each group has at least $$1$$ can of tuna, and the number of cans in each group \uline{cannot be the same}. There are at mostcans of tuna in the group that has the largest number of cans. 
选项为:A:$$6$$  B:$$18$$  C:$$21$$  D:$$24$$  请回答其中一个选项.