Answer:
One reason that people may desire to migrate away from metropolitan areas is an overcrowding population.
Explanation:
While living in a metropolitan area has many benefits (career and education opportunities for example) most people end up leaving because the busy atmosphere isn't for them. Whether there is a lack of sanitation from overcrowding, noise at all hours of the night, or the size of the population isn't desirable. 
I'm also going to assume this is for AP Human Geography, a test I took a few years ago and passed :)
 
        
             
        
        
        
The creative curriculum model claims to be guided by all of the following researchers D. Howard Gardner
        
                    
             
        
        
        
Answer:
CDs or 500 DVDs. The U.S. can produce either 90 CDs or 30 DVDs.
Explanation: