Answer: 7000mph
Step-by-step explanation: In an explosion the outward rush of gases differentiates the type of explosive that is being used, for example, from gas explosives the ranges are from 1800 m/s to 3000m/s, and for solids, the range is 4000m/s to 10300 m/s, the options seem to be in the range of the gas explosives, so i will consider that the question is asking about these type of explosives.
Now, the units in the options are in mph, this stands for miles per hour, so we must change the units in the ranges:
1m = 0.000621371 miles
1 hour = 3600 seconds.
Then, for gas explosives we have:
Then 1800m/s = 1800*0.000621371*3600 = 4026.48408 mph
3000m/s = 3000*0.000621371*3600 = 6710.8068 mph
So we can see that the biggest recorded velocities for gas explosives is around 7000mph. then the correct option is the last one, 7000mph