For the number sentence below, what is the answer?  15 + 15 + 15 + 15 + 15 + 15 + 15 + 15 + 15 + 15 + 15 + 15 + 15 + 15 + 15 
选项为:A:$$210$$  B:$$215$$  C:$$220$$  D:$$225$$  E:None of the above  请回答其中一个选项.