I think you mean the Golden Spike which is the ceremonial final spike driven by Leland Stanford to join the rails of the First Transcontinental Railroad across the US connecting the Central Pacific and Union Pacific railroads in 1869 in Promontory, Utah.
        
                    
             
        
        
        
The answer would be C.
Hope I helped
        
             
        
        
        
It’s in Spanish I don’t understand it
        
             
        
        
        
B this is an obvious answer