单选题 By advocating moderate change, they think that they can keep consumer costs low.
【正确答案】 A
【答案解析】[解析] moderate“适中的，适度的”，四个选项：reasonable“合理的，适中的”；radical“激烈地，猛烈地”；immediate“立刻，马上地”；minimum“最少量”；所以A项符合题意。