The THREE items that CORRECTLY describe aspects of the building of the First Transcontinental Railroad are:
A. It crossed the Rocky Mountains.
D. Large number of Irish immigrants were used in construction going westward.
F. The Central Pacific and Union Pacific railroads met at Promontory Point, Utah, completing the project.
Responses B, C, and E are incorrect. The railroad did not cross the Appalachian Mountains, large numbers of Chinese immigrants were used in the construction by the Central Pacific (not Japanese), and the railroad was completed after the Civil War ended.