There are only apple trees and pear trees in the orchard. The number of apple trees is three times that of pear trees. Pear trees are 12 less than apple trees. How many fruit trees are there in the orchard？ 
选项为:A:$$18$$  B:$$20$$  C:$$22$$  D:$$24$$  E:$$26$$  请回答其中一个选项.