[单选题]Which SQL statement accepts user input for the col

ASELECT &1, &2 FROM &3 WHERE last_name = '&8';

BSELECT &1, '&2' FROM &3 WHERE '& last_name = '&8';

CSELECT &1, &2 FROM &3 WHERE last_name = '&8';

DSELECT &1, '&2' FROM EMP WHERE last_name = '&8';