The ancient Romans traveled by carriage, chariot, walking, and horseback riding. They used reservoirs for transportation.
The ancient Romans traveled by carriage, chariot, walking, horseback riding, and litter riding. A litter was a cart that slaves carried on their shoulders and used to transport wealthy people, so they didn't have to walk.
Infrastructure made it easier to transport goods between Roman cities for trade is (C) reservoirs.
Therefore, option C aptly explains the statement.
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