Continuing the previous situation, the car decelerates at 7 m/s2 throughout the final one-second interval and its velocity at the end of the interval is zero. Determine the speed of the car at the beginning of this one-second interval by choosing one of these values inside your explanation: (A) 7 m/s, (B) 3.5 m/s, (C) 14 m/s, (D) 0 m/s.