The passage clearly calls for actual good relationships between the countries, not pretend good relationships (this s what the first option refers to). 
Also, the purpose of the good relationships is to establish "world peace", which at the time meant the prevention of nuclear conflict. 
Therefore, the best answer is the following option:
<span>establishing friendly international ties and coexistence would prevent a nuclear warfare outbreak
</span>
        
                    
             
        
        
        
A. Emperor Alexander Severus, who was assassinated by his troops after a defeat.
B. Roman Senade, which accepted some army generals as legitimate emperors. 
C. Security of the border, which they were supposed to keep. While the were fighting among themselves, they neglected the defenses of the Emprire, resulting in invasions.
D. Crisis, which ended with the Reforms made by Diocletian.
 
        
             
        
        
        
Chinese people accepted the Zhou rulers who took over from the Shang because they _____
believed in the mandate from heaven
        
             
        
        
        
Answer:
Legal education is the education of individuals in the principles, practices, and theory of law. ... Advanced academic degrees in law, such as masters and doctoral degrees. Practice or training courses, which prospective lawyers are required to pass in some countries before they may enter practice.