HELP ME What is significant about Promontory Summit, Utah? (2 points)

a
It is the beginning of the South Pass through the Rocky Mountains.

b
It is the end of the Transcontinental Railroad in the west.

c
It is where President Washington made his last speech.

d
It is where the last spike was driven to complete the Transcontinental Railroad.

D

Explanation:

Promontory Summit, Utah Territory marks the site where the First Transcontinental Railroad was officially completed, although a direct coast-to-coast rail journey on this route was not achieved until 1873.

the answer is a.

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