Plate tectonic theory explains why continents continue to move. The planet's outer shell consists of plates that move a few centimeters a year. Heat from the Earth's interior causes this motion to happen via convection currents in the mantle. 
 
        
             
        
        
        
The answer would be D. collective bargaining. 
        
             
        
        
        
Answer:
In helping to formulate the President's spending plans, OMB evaluates the effectiveness of agency programs, policies, and procedures, assesses competing funding demands among agencies, and sets funding priorities.
Explanation:
 
        
             
        
        
        
Answer: Social workers are professionals who work in favor of the society. 
Explanation:
The social workers think and act in accordance with need and betterment of the society. According to the given situation, the social worker cannot keep the information about the client related to the plantation of bomb as this information is against the betterment of the society and it can be against the safety and security of nation's citizens. This attempt could be responsible for mass killing and cannot be in favor of society so social worker must reveal this information to the criminal justice department. 
 
        
             
        
        
        
Answer:
A.  
Samudra Gupta was the emperor who gained the most land.
Explanation: