单项选择题

Cars are an important part of life in the United States. Without a car most people feel that they are poor. And even if a person is poor he doesn’t feel really poor when he has a car.
There are three main reasons the car became so popular in the United States. First of all, the country is a huge one and Americans like to move around in it. The car provides the most comfortable and cheapest form of transportation. With a car people can go any place without spending a lot of money.
The second reason why cars are popular is the fact that the United States never really develops an efficient and inexpensive form of public transportation. Long-distance trains have never been as common in the United States as they are in other parts of the world. Nowadays there is a good system of air service provided by plane. But it is too expensive to be used frequently.
The third reason is the most important one, though. The American spirit of independence is what really made cars popular. Americans don’t like to wait for a bus, or a train or even a plane. They don’t like to have to follow an exact schedule. A car gives them the freedom to schedule their own time. And this is the freedom that Americans want most to have.

The third paragraph implies, but doesn’t directly state, that（）.

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