Grandmother baked cookies for her grandchildren, some of whom were going to visit her that day. She wanted each of her grandchildren to have the same number of cookies, but she forgot if three, five, or six grandchildren were coming. So, she baked enough cookies so that there would be an equal number for every grandchild regardless of how many visited. Which of these could be the number of cookies Grandmother baked? 
选项为:A:$$12$$  B:$$15$$  C:$$18$$  D:$$24$$  E:$$30$$  请回答其中一个选项.