I would say C, schizophrenia,
because schizophrenia is "a mental disorder that in many ways centers around not recognizing what is part of reality – namely, having psychotic breakdowns." It is not related to anxiety, as anxiety is classified as "neurotic" while schizophrenia is classified as "psychotic".
        
             
        
        
        
Children who experience early puberty have higher rates of depression and anxiety compared to their peers. This effect is found consistently in girls, but findings involving boys are less clear.
        
                    
             
        
        
        
The answer is B, social cognitive theory. 
Hope this helps :)
        
                    
             
        
        
        
 a brick is a part of a house but that doesnt mean you can call it a house itself! similarly asana is just a part of yoga but that doesnt mean you can call it yoga!