Which option correctly specifies the end of variables being read from an INFILE in SAS?

The correct option indicates the use of the DSD option in SAS, which stands for "Delimiter-Sensitive Data." When reading from an INFILE statement, specifying DSD serves a specific purpose: it tells SAS to treat consecutive delimiters as missing values, and it also enables the handling of quotation marks correctly. This is particularly useful when working with CSV files where certain rows may have fields that are empty.

By using the DSD option, SAS can accurately parse the data according to the defined delimiters, effectively understanding where one variable ends and another begins. This helps in maintaining the integrity of the data being read, ensuring that data fields with embedded delimiters or missing values are processed reliably.

Other options do exist for controlling various aspects of reading data, but DSD is specifically for denoting how to handle delimiters and missing values when reading from INFILE. The other choices pertain to different functionalities that do not correctly address the control of variable endings during data importation.