Which DO LOOP will create the output SAS data set WORK.LAB_NEW?

This question will ask you to provide a section of missing code.

Given the input SAS data set LABRAW:

Which DO LOOP will create the output SAS data set WORK.LAB_NEW?
A . do i=1 to 2; visit=i; date=dat{i}; result=num{i}; output; end;
B . do i=1 to 2; visit=i; date=dat{i}; result=num{i}; end; output;
C . do i=1 to 2; do j=1 to 2; visit=i; date=dat{j}; result=num{j}; output; end;
D . do i=1 to 2; do j=1 to 2; visit=i; date=dat{j}; result=num{j}; end; output; end;

View Answer

Answer: A