In a comparable sales analysis, a subject property lacks a garage that the comparable has. The appraiser would make a:

Explanation

When the comparable has a feature the subject lacks (superior feature), the appraiser adjusts downward on the comparable (subtract). When the comparable lacks a feature the subject has (inferior), the appraiser adjusts upward. In this case the comparable is superior, so a downward (negative) adjustment is made to the comparable. So the adjustment to the comparable is negative/downward. The correct answer is a negative adjustment to the comparable.