In Wufeng weather, leaves on both sides of the road will flutter after fast cycling on the expressway, as shown in the figure.

Cars pass through the middle of the road, which drives the air flow nearby and speeds up the air flow. The faster the air flows, the smaller the air pressure will be, so the atmosphere on both sides of the road will be pressed to the middle, and the leaves on both sides of the road will float inward under the pressure difference. After the car is driving on the road, leaves will float into it. Looking at the chart, we can see that the leaves are floating in the direction A, so A is right and BCD is wrong.

So choose a.