Which sentence correctly uses possessive punctuation for a singular noun ending in s?

• A. The boss's car.
• B. The boss' car.
• C. The bosss car.
• D. The bosses car.

Answer: (A)

When forming the possessive for a singular noun that ends in s, you typically add ’s to show ownership. That makes the sentence The boss's car correct, since it shows the car belongs to one boss and preserves the standard possessive form by adding an apostrophe plus s after the final s.

The other forms don’t fit this common rule: using only an apostrophe after s (The boss' car) is a stylistic alternative used in some contexts, but the version with ’s is the more widely taught standard here. Writing bosss car adds an extra s that isn’t part of the word, which is incorrect. Leaving out the apostrophe (The bosses car) fails to indicate possession at all.