The correct answer is: None of these.
After the detonator explodes, the driver should not proceed at all. The detonator is a safety device that is designed to prevent the vehicle from moving if there is a problem. If the driver proceeds after the detonator has exploded, they could be putting themselves and others at risk.
Option A: 1.5 km is not a safe distance to proceed after the detonator has exploded. The driver should not proceed at all.
Option B: 0.1 km is not a safe distance to proceed after the detonator has exploded. The driver should not proceed at all.
Option C: 2 km is not a safe distance to proceed after the detonator has exploded. The driver should not proceed at all.
Option D: None of these is the correct answer. The driver should not proceed at all after the detonator has exploded.