She is a very ( ) housekeeper, because she always buys things

She is a very ( ) housekeeper, because she always buys things at the lowest possible price.
A、economic
B、economics
C、economical
D、economy
【正确答案】：C
【题目解析】：economics 经济学，economical 节约的，economic 经济的 economy 经济，句子含义是她是个节约的家庭主妇，她经常以最低的价格买东西。