Sorry but i dont think a lot of people know this
The sentences that use commas correctly is A) Volcanoes spew molten rock and, mostly exist along the Pacific Rim.
Atlanta is 3 hours ahead of Seatle. (USA Eastern Time)
So, If I live in Atlanta and my grandparents love in Seattle, and they want to call me before 10 pm, I should expect their call around 7 pm in Seatle
Answer: They help to clarify what happened in a crime.
Explanation: Witnesses tell the judge and/or jury everything they know about an event. A witness is someone who has <em>relevant information</em> about a crime that had taken place.