What did the Aztecs build to connect their island city to the mainland?

They built three major causeways to connect their island to the mainland.

“the battle of stalingrad is not a turning point necessarily in strategic terms, because a lot more has to be done before the soviets can be certain of defeating germany,” says renowned world war ii historian richard overy. the germans had fought nearly a thousand miles across the soviet union to get to stalingrad.

your answer would be (b)