Answer:
Notifying Serena of any material changes
Explanation:
With Serena now serving as their (Mark and debbie Calhoun) agents, it is paramount that Serena (the agent) be notified about any material changes made by the buyers. The buying agents (in this case Serena) is an individual or organization that is responsible for purchasing goods or property on behalf of another person. They are usually license professionals who search and undergo the purchasing procedure of products that their clients is interested in owning. 
 
        
             
        
        
        
The correct answer is a becuse i just did that questiom
        
             
        
        
        
Answer:
D
Explanation:
 D is the answer sjkrkdrir
 
        
             
        
        
        
Answer:
c. inferior good.
Explanation:
Inferior goods are items purchased buy a consumer as a result of his limited income such that when that consumer's purchasing power increases, he purchases other commodities in place of the one initially purchased.
Hence the  purchase more T-bone steak and less hamburger is an indication that hamburger is an inferior good to the consumer.
 
        
             
        
        
        
 There are several ways you can find a record. The easiest way is by using  the find command. You can do this by pressing the combination keys Control + F. You will then see a mini search box in the top right corner of your screen.   Lastly, type in the word, phrase, or record that you want to find.  You will then be directed to several highlighted words, and TADA! :D 
Hope this helps  :)