Ellis\textquotesingle s Eel Emporium contains a large tank holding three different types of eel: electric eels, moray eels and freshwater eels. A notice on the tank reads as follows:  All the eels are electric eels except for $$12$$  All the eels are moray eels except for $$14$$  All the eels are freshwater eels except for $$16$$  How many eels are in the tank? 
选项为:A:$$42$$  B:$$33$$  C:$$24$$  D:$$21$$  E:$$20$$  请回答其中一个选项.