Question #N769

The sentence "The dog, who is a golden retriever, chased the ball into the street" contains an error in punctuation. What is the correct way to punctuate this sentence?

Which of the following is the correctly punctuated version of the sentence?
A. The dog who is a golden retriever chased the ball into the street.
B. The dog, who is a golden retriever, chased the ball into the street.
C. The dog who is a golden retriever, chased the ball into the street.
D. The dog, who is a golden retriever chased the ball into the street.