Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now listen to the conversation. According to the conversation, how did colonists try to make traveling in cities easier
A．By widening the streets. B．By using coaches to provide free public transportation. C．By preventing carts from entering town. D．By making laws to keep farm animals off the street.