参考答案

正确答案：C
解析：事实细节题。根据第三段第三句If you do not pay your card off every month，your reward could easily be overshadowed by monthly interest payments可知，如果你没有按月还清卡上的债务，你要支付的利息就可能会高于你得到的返现，与此相符的是C。根据第三段第二句Only if you do not have to pay an annual fee and you pay your credit card off every month可以得出，A表述 错误；D项叙述过于绝对，与文章中Not，too many companies表达不符，可排除。因此正确答案为C。