.Choose the option that best punctuates the given sentence : A few years ago thirty nine people witnessed a brutal attack

• A. A few years ago, thirty-nine people wit nessed a brutal attack.
• B. A few years ago, thirty-nine people wit nessed a brutal attack.
• C. A few years ago thirty-nine people, wit nessed a brutal attack.
• D. A few, years ago, thirty nine people wit nessed - a brutal attack!