A. The man who sold the car is happy.
B. The man, who sold the car, is happy.
C. The man who sold, the car is happy.
D. The man who sold the car, is happy.
Answer: The man who sold the car is happy.
A. The man who sold the car is happy.
B. The man, who sold the car, is happy.
C. The man who sold, the car is happy.
D. The man who sold the car, is happy.
Answer: The man who sold the car is happy.
Additional Information: Commas are not needed for restrictive clauses.
Subjects: Punctuation, Grammar