Pick the best topic sentence for the following description paragraph:
The driver's seat and steering wheel are on the right side of
the vehicle, like in Europe. There are big sliding doors with
large windows, so the mail carrier can drive right up to a
mailbox on the street without getting out of the truck. Its
most distinctive feature however is the large, blue United
States Postal Service symbol on both sides of the boxy
vehicle. A mail truck is an interesting means of
transportation.
A. There are all kinds of trucks.