PLEASE HELP!! ILL GIVE BRAINLIEST what happened regarding the railroad on may 10th 1869?

A. the central pacific and union pacific railroad companies agreed to lower prices.
B. the central pacific and union pacific railroad companies were denied land grants for expansion.
C. the central pacific and union pacific railroad companies connected a track at promontory point, UT.
D. the central pacific and union pacific railroad companies merged to form a monopoly.

Explanation:

The leaders of the Union Pacific and CPR railroads met at Promontory, Utah on 10 May 1869 and brought a symbolic last spike onto their railway lines. For the first time in U.S. history this allowed transcontinental railway travel.

c

Explanation:

they used a gold spike to celebrate

ghana achieved independence peacefully, while algeria gained independence through an armed struggle.

these civilizations were located around fertile rivers, where they could produce an abundance of crops