Read the sentences. canal systems connected eastern factories with western markets. two of these were the erie system and the pennsylvania chain. the railroads followed similar routes. which best combines the sentences into one clear and engaging sentence? a. canal systems and railroads connected eastern factories with western markets, two of which were the erie system and the pennsylvania chain. b. canal systems and railroads, like the erie and pennsylvania chains, connected eastern factories with western markets. c. the erie system and the pennsylvania chain are examples of types of transportation, like canals and railroads, that connected eastern factories and western markets. d. canal systems, like the erie system and the pennsylvania chain, connected eastern factories with western markets, as did railroads.