Catching a bus can be the cheapest way of traveling between cities. It
is often the only way of getting to smaller towns if you are not
driving a car. Remember that bus travel can be very long due to the
great distances involved. Most buses have air conditioning and a
washroom on board. The largest network of bus routes is run by a
company called Greyhound and its affiliates.
The answer would be D the year the source was published.
