A vehicle operated by radio is moving across the surface of a planet. The vehicle detects an obstacle in front of it. It transmits a radio signal to the control room that is controlling it. The control room is $2.4\times10^{6}\ \text{km}$ from the vehicle. The control room then sends a signal back to the vehicle telling it to stop. What is the shortest time that passes between the vehicle detecting the obstacle and receiving the signal back from the control room?
- A$8.0\ \text{ms}$
- B$16\ \text{ms}$
- C$8.0\ \text{s}$
- D$16\ \text{s}$