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

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

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

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

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