contestada

Which describes a major challenge facing the builders of the transcontinental railroad?

A.
tunneling under Lake Erie

B.
crossing the Sierra Nevada mountains

C.
spanning the Grand Canyon

D.
bridging the Rio Grande River

Respuesta :

"bridging the Rio Grande River" would be the best option from the list, since this large river was directly in their desired path, although of course they face many other obstacles as well.

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