Answer:
B. first transcontinental railroad
Explanation:
<u>Panama Canal railroad started operating in 1855. and it was the first railroad that connected two oceans directly.</u> Building the canal back then was a difficult task, so they have decided to build the railway first.
<u>The railway was significant in the later construction of the Canal </u>– it provided the perfect means of transportation for material, workers, and equipment necessary for the construction.<u> It ran from the Atlantic Ocean to the Pacific Ocean, over the Isthmus of Panama, and was the first transcontinental railroad in the world.</u> The railroad still is in function today.
Panama Canal was started in the 1880s, following the parallel route of the railroad. It started operating in 1904.
