Which statement best explains why the transcontinental railroad took several years to build? O Digging through mountains was difficult, and harsh weather slowed progress.
O Several Civil War battles took place nearby and kept work from progressing.
O Congress fought over funding for the railroad, leading to work stoppages.
O Immigrants were not interested in railroad work, which made it hard to fill jobs.

C.

Explanation:

digging through the mountains was very difficult, and the long winters hampered workers' ability to make progress

Explanation:

The Transcontinental Railroad took several years to build because of its geographical condition which made the region harsh than the East. Railroad shortened travel time between the East and West. It took several years because every bit of work was done by the workers with their hands.

a. i just did this quiz and the answer is a.