here is one more thing we would let you know that the quoted price is valid for one mo

here is one more thing we would let you know that the quoted price is valid for one month only because of the fluctuating exchange rate of RMB to USD.()

：A.另外希望贵方清楚，因人民币对美元汇率的变化，我方所有报价格有效期为一个月。

B.另外希望贵方清楚，我方现报价格有效期为一个月。

C.另外希望贵方清楚，因人民币对美元汇率的变化，我方现报价格有效期为一个月。

D.因人民币对美元汇率的变化，我方现报价格有效期为一个月。

请帮忙给出正确答案和分析，谢谢！