The following SAS program is submitted:


data work.january;
set work.allmonths (keep = product month num_sold cost);
if month = 'Jan' then output work.january;
sales = cost * num_sold;
keep = product sales;
run;

Which variables does the WORK.JANUARY data set contain?
A. PRODUCT and SALES only
B. An incomplete output data set is created due to syntax errors.
C. PRODUCT, MONTH, NUM_SOLD and COST only
D. PRODUCT, SALES, MONTH, NUM_SOLD and COST only