Answer:
the correct answer is D. Macroeconomics is the study of the economy as a whole, while microeconomics deals with the individual decision-making units. 
Explanation:
Macro economics emerged as a seperate disclipline in the late 1930's witht eh influence of the prominent british economist John Meynard Keynes. it looks at the economy as a whole and tries to solve major economic issues affecting the national economy such as the unemployment, inflation, GDP and current rate changes.
Micro economics on the contrary, looks at how the individuals and firms behave in an economy and tries to explain their decisions and how they react.
 
        
             
        
        
        
To answer the question above on how can international trade agreements lead to economic growth is that it can boost the country's development special to the third world country or other poor country that needs to open their market benefiting that it earns because of more investments coming in.
        
             
        
        
        
A is the answer i am very good at loans and the answer is A