Aztecs built causeways and canals to aid transportation to and from the city.
Causeways are raised roads which are built to aid the people to easily travel or navigate over the swampy and wet areas.
This system of causeways and canal aided the supply to hundreds of thousands of people who lived in the Aztec city of Tenochtitlán between 1325 and 1521 A.D.
According to the question, the correct option is D because causeways aided transportation by land.
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