Answer:
B, C, D, F
Explanation:
if you know the length and width of the traffic jam is (F and C) you can start to calculate how many cars are stuck in it. then by using how long the vehicles are and how long the space between them is you can find out how many cars would fit in this area. (B and D)
A and F are irrelevant because the question is simply asking how many vehicles in the jam not how many people or what cuased it.
hope this helps :]