Which sentence from the article is the best reason people started building canals?
a. The one major problem with having faster steamboats was that most rivers don’t connect to each other.
b. River travel improved quickly with the steam engine, which produces more power than a team of horses and can pull heavier loads.
c. The Erie Canal connected Midwest goods with the Atlantic Ocean, making it easier to trade with foreign countries.
d. The one major problem was that most rivers don’t connect to each other, and so people started building canals.