$2$ ducks, $2$ rabbits and $1$ dog together weigh $14$ kg. $3$ ducks and $1$ rabbit together weigh $6$ kg. $1$ dog weigh $1$ kg more than $1$ rabbit and $1$ duck weigh together. How much does a duck weigh? 
选项为:A:$$1$$ kg  B:$$2$$ kg  C:$$3$$ kg  D:$$4$$ kg  E:$$5$$ kg  请回答其中一个选项.