Four people each take a bucket of water to the faucet and the time required to fill the buckets of the four people are $$1$$ minutes, $$3$$ minutes, $$2$$ minutes, and $$5$$ minutes respectively. If only one tap is available, how can we arrange the order of the four people getting water so that their total waiting time is the shortest? This minimum total time by all four people is  minutes. (The time spent fetching water is also counted within waiting time) 
选项为:A:$$11$$  B:$$18$$  C:$$21$$  D:$$24$$  请回答其中一个选项.