Answer:
D. 1949
Explanation:
Each of these 3 events took place in the year 1949.
1. The soviet union tested it's first atomic bomb on the 29th day of August 1949 in what is now the modern day kazakhstan.
2. NATO was formed on the 4th of April 1948. It was formed by 12 founding members of alliance.
3. This is also known as the greta retreat. Also happened in 1949. The leaders of the Kuomintang fled to Taiwan.
 
        
             
        
        
        
Answer:
Scientific Revolution both further weakens the power of the Catholic Church as well as inspires  It allows people to start thinking that what they are being told by the church is not right and there is scientific proof to prove what is going on.Roots of the Scientific Revolution. The scientific revolution, which emphasized systematic experimentation as the most valid research method, resulted in developments in mathematics, physics, astronomy, biology, and chemistry. 
Explanation:
 
        
             
        
        
        
D. Russia suppressed Czechoslovakia after citizens demanded reform.
A. Russia suppressed Hungary after citizens demanded reform.
Explanation:
hope this helps :)
 
        
             
        
        
        
I believe the answer is d