I would be very ________ if you could give me an early reply.

I would be very ________ if you could give me an early reply.
A、grateful
B、helpful
C、thanking
D、satisfying
【正确答案】：A
【题目解析】：grateful 感恩的；helpful 有帮助的；thanking n.感谢语；satisfying adj 令人满意的；句意：如果你能早一点给我答复，我将非常______。A 符合题意。