在刷70题时发现12题的答案有不同的版本，米粮包中的PDF说选C，Crackman大神的blog中选的是A。

个人认为Crackman的答案更加准确，请问大神们这道题到底应该选什么？万分感谢！

题目：
12.The Excel workbook QTR1.XLS contains the following three worksheets:
JAN
FEB
MAR
Which statement correctly assigns a library reference to the Excel workbook?
A. libname qtrdata 'qtr1.xls';
B. libname 'qtr1.xls' sheets=3;
C. libname jan feb mar 'qtr1.xls';
D. libname mydata 'qtr1.xls' WORK.heets=(jan,feb,mar);