Immigration drastically increased in the United States during the period between the Civil War and the early 1900s. This immigration boom coupled with increased development and industrial output following the Civil War led to large economic growth in the United States as well. 
        
                    
             
        
        
        
Answer:
Extinction
Explanation:
Extinction, in psychology, actually refers to the gradual weakening of a conditioned response that results in the decrease or disappearance of behavior completely, which is the case here. In other words, it is how the conditioned behavior eventually stops. 
 
        
             
        
        
        
B) The murder of an on-duty police officer.
        
                    
             
        
        
        
Reform movements worked only for child labor laws, safety in the workplace, and women’s suffrage.
The Gilded Age was the period in the United States history from the 1870s to nearly 1900. The Gilded Age was a period of speedy industrial growth, notably in the North and West. As American wages were much higher than the wages in  Europe, particularly for experienced workers, at this time America saw the penetration of millions of European migrants.
However during this Age, the authoritative issues were notably concerning prohibition of, ethnic or racial groups. With the speedy growth of towns, federal agencies frequently took command over metropolitan. In trade, influential regional trusts were established in some enterprises. These Associations crusaded for the long working hours and the eradication of child labor. Middle-class reformers also demanded assistance improvement, temperance of alcohol and beer, and women's suffrage. 
 
        
                    
             
        
        
        
I'm guessing none? because a rock is not living in the first place