The average weight of dogs that come to a certain vet\textquotesingle s office is 55.6 lbs, with a standard deviation of 2.2 lbs. If the weights are normally distributed, what percent of dogs weight more than 60 lbs? 
选项为:A:66.8\%  B:47.2\%  C:33.4\%  D:15.9\%  E:2.28\%  请回答其中一个选项.