Base SAS 36

The following SAS program is submitted:
data work.sales;
do year = 1 to 5;
do month = 1 to 12;
x + 1;
end;
end;
run;
Which one of the following represents how many observations are written to the WORK.SALES data set?
A. 0
B. 1
C. 5
D. 60
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