Which sentence uses a comma and a coordinating conjunction correctly to separate two independent clauses?

O A. Just then, Kento and Izumi burst through the door holding bags of groceries

O B. The chef from DiNatale's, an Italian restaurant, will be here at 7:00.

O C. Brent wants to buy a telescope, but it will take him 14 more months of working at Burger Palace to save up the money.

O D. Becca's and Katrina's dad, who was driving, stepped on the gas and, all of the passengers leaned back in their seats.​