某学校准备购买$$30$$个篮球，三家商店每个篮球的售价都是$$25$$元，但优惠方法不同，甲店``买九赠一''，乙店``打八八折''；丙店``满$$100$$元减现金$$10$$元''，为节约资金，应该到店购买．  A school is going to buy 30 basketballs. The price of each basketball in the three stores is 25 yuan, but the preferential methods are different. Store A "buy nine and get one free", store B "give a 20\% discount";~Store C ~"full 100 yuan minus 10 yuan in cash", in order to save money, should go toshop to buy. 
选项为:A:甲  B:乙  C:丙  D:任意一个店皆可  请回答其中一个选项.