第110题，题目如下
The contents of the raw data file EMPLOYEE are listed below:
----|----10---|----20---|----30
Ruth 39 11
Jose 32 22
Sue 30 33
John 40 44
The following SAS program is submitted:
data test;
infile 'employee';
input employee_name $ 1-4;
if employee_name = 'Ruth' the input idnum 10-11;
else input age 7-8;
run;
Which one of the following values does the variable IDNUM contain when the name of the employee is 'Ruth'
A.11
B.22
C.32
D.missing numeric value
答案选的是B，不知道为什么，求助，先谢谢了啊~

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