Answer:
Technically speaking: 31. (Or C.)
Step-by-step explanation:
We can solve this quite simply by dividing 364(amount of people) by 12(amount of people per van).
Which would look like this: 364/12=30.3333
The reason being for it being 31 and not 30 is because you would need one extra van to take the remaining 4 people that was not picked up by the 30th van, otherwise only 360 people would've been picked up.
