27.Given the SAS data set WORK.TEMPS:
Day Month Temp
---  -----  ----1 May 75
15 May 70
15 June 80
3 June 76
2 July 85
14  July 89
The following program is submitted:
proc sort data=WORK.TEMPS;
by descending Month Day;
run;
proc print data=WORK.TEMPS;
run;
Which output is correct?
为什么正确答案是C呢？  
C.
Obs Day Month Temp
1 1 May 75
2 15 May 70
3 3 June 76
4 15 June 80
5 2 July 85
6 14 July 89

我总觉得是A
Obs Day Month Temp
1 2 July 85
2 14 July 89
3 3 June 76
4 15 June 80
5 1 May 75
6 15 May 7