Which code was used to create AGECAT?

Given the following partial output data set:

Which code was used to create AGECAT?
A . if age <18 then AGECAT=1; if 18<=AGE<=40 then AGECAT=2; else AGECAT=3;
B . if age <=18 then do AGECAT=1; else if 18<AGE<=40 then do AGECAT=2; else do AGECAT=3;
C . if age <18 then AGECAT=1; else if 18<=AGE<=40 then AGECAT=2; else AGECAT=3;
D . if age <=18 then AGECAT=1; else if 18<AGE<=40 then AGECAT=2; else AGECAT=3;

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Answer: D