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有一道在advanced 130里的题不懂，求大神解答。题目是130-v2 的第80题， 如下：
80. The following SAS program is submitted:
%let rc = Begin;
%macro test;
data out;
set sashelp.prdsale nobs = totalobs;
if totalobs > 10 then do;
%let rc = high;
end;
else do;
%let rc = low;
end;
run;
%mend;
%let rc = Before Execution;
%test
The data set SASHELP.PRDSALE has 50 observations. What is the value of the variable RC when the macro finishes execution?
A.low
B.high
C.Begin
D.Before Execution
答案是a，我也跑的程序的确是a。
请大神指教！
感谢！
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