SAT English Practice Question

“A group of friends, gathering to celebrate a special occasion, can be a magical event, especially when they are all there in the same place, at the same time.” The above sentence contains an error in the use of commas. What is the most logical way to correct the sentence?

1. A.A group of friends, gathering to celebrate a special occasion, can be a magical event especially when they are all there in the same place, at the same time.
2. B.A group of friends gathering to celebrate a special occasion, can be a magical event, especially when they are all there in the same place, at the same time.
3. C.A group of friends gathering to celebrate a special occasion can be a magical event, especially when they are all there in the same place, at the same time.
4. D.A group of friends gathering to celebrate a special occasion, can be a magical event, especially when they are all there in the same place at the same time.