Chris's attitude change is best explained by cognitive dissonance. 
It refers to the fact that a person may be experiencing thoughts and feelings which are not really consistent, and which may change, sometimes drastically. In Chris's case, he hated pop music, until he actually listened to one pop song and liked it, and then changed his opinion. 
        
             
        
        
        
The code Nior was also known as the slave code so your answer would be D the slave population. 
        
                    
             
        
        
        
The correct answer is D.
John Muir (1838-1914), also known as the <em>Father of the National Parks</em> contributed through his activism to the presevations of US wildlands, such as Yosemite Valley or the Western forests. 
He founded the environmental organization <em>Sierra Club. </em>He also wrote many articles and up to 10 books, describing his travelling experiences and enthusiastically promoting echological behaviours and preservation principles. 
 
        
                    
             
        
        
        
Answer: The answer is A. RESEARCHER ARE INVESTIGATING CONTENT THEORIES OF MOTIVATION
Explanation: Content theories of motivation study the drive that makes people behave in a particular type of way. It identifies the internal factor that influences how people are motivated. It includes:
- Hierarchy of needs theory
- ERG theory
- Acquire needs theory
- Two factory theory