https://documentation.sas.com/?docsetId=proc&docsetTarget=n12jw1r2n7auqqn1urrh8jwezk00.htm&docsetVer The default sort order for PROC SORT in SAS is ascending. This means that if no other sort order is specified, SAS will arrange the data in ascending order based on the values of the variable(s) listed in the BY statement.
Here's an example:
* proc sort data=mydata; by variable; run; sorts mydata by variable in ascending order by default.
The other options are incorrect in the context of the default sort order:
* A. 'Internal' is not a sort order.
* C. 'Formatted' refers to sorting data based on formatted values, not the default order.
* D. 'Descending' is an alternative sort order that must be explicitly specified with the DESCENDING keyword.
References:
* SAS 9.4 documentation for the PROC SORT statement: [SAS Help Center: PROC SORT]