Which of the following statements about the transcontinental railroad is not accurate?

a. the union pacific railroad began its line in omaha, nebraska, and built west.

b. the transcontinental railroad ran from omaha to san francisco.

c. chinese laborers performed the most difficult and hazardous tasks of building bridges and tunnels in the sierra nevada mountains.

d. the union pacific and central pacific railroads finally met at promontory, utah, on may 10, 1869.