Answer:
people have migraines for various reasons such as stress, and weather change
Explanation:
although the best way to get rid of them is medicine, there can be some simple solutions such as de-stressing, or staying indoors with the lights off without screens for a while. However. this is not garunteed to work.
 
        
                    
             
        
        
        
It's definitely letter A. Mononucleosis
        
                    
             
        
        
        
Answer:
Life-span perspective.
Explanation:
Life span perspective may be defined as a type of development of human beings that shows the multiple frameworks of an individual. This is one of the most important perspective use in the study of psychology.
This perspective includes the all the different factors like genetics, gender, school, environment and society can influence the adolescents. These factors can influence the self esteem of the adolescents positively or negatively. The genetic factors is important to determine the physical influence of individual. 
Thus, the answer is life span perspective.