Final answer:
The minimum arming range of the M136 AT-4 anti-tank weapon is 10 meters.
Step-by-step explanation:
The minimum arming range of the M136 AT-4 anti-tank weapon is 10 meters. This means that the weapon needs to travel at least 10 meters before it becomes armed and can detonate upon impact with its target. Arming time is required for the weapon to stabilize and ensure proper functioning before it can be used effectively. Therefore, the correct answer is b) 10 meters.