——Could we put off the meeting?She asked.——“______,”

——Could we put off the meeting?She asked.——“______,”
——Could we put off the meeting?She asked.
——“______,”he answered politely.“This is the only day everyone is available.”
A.Not likely
B.Not exactly
C.Not nearly
D.Not really
卷子中给出的答案是D,但是题目中问的是Could……,那答语不应该是不可能,然后选A么?可是为什么选的是D.
不要质疑答案的正确性,这是一道高考题,答案确实是D,愁死了.