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单项选择题

哪个SAS程序读取ID的值并保存每个Quantity值的记录,以便为每个记录创建三个观察值?()……

哪个SAS程序读取ID的值并保存每个Quantity值的记录,以便为每个记录创建三个观察值?()



A.data work.sales;infile unitsold;input ID $;do week=1to 3;input Quantity :comma.;output;end;run;
B.data work.sales;infile unitsold;input ID $@@;do week=1to 3;input Quantity :comma.;output;end;run;
C.data work.sales;infile unitsold;input ID $@;do week=1to 3;input Quantity :comma.;output;end;run;
D.data work.sales;infile unitsold;input ID $@;do week=1to 3;input Quantity :comma.@;output;end;run;