C is the best answer I guess
        
             
        
        
        
I believe it is C), leaders. :)
        
                    
             
        
        
        
Which of the following is true whether you use a direct
quote or an indirect quote?
The only true whether to use a direct quote or an
indirect quote is that ‘You must use quotation marks to indicate the evidence.’
The answer is letter A.
 
        
                    
             
        
        
        
The answer is A - “it lacks a variety of sentence structure.” :)
        
                    
             
        
        
        
TLDR: The common noun is "sandwich".
A common noun is a person, place, or thing that isn't being described specifically. A proper noun is a person, place, or thing that is being described specifically. For example:
A house (CN), versus The White House (PN)
A Meatball Marinara (PN) versus a footlong sub (CN)
New York City (PN) versus The Big Apple (PN) versus a city (CN)
Proper nouns can typically be identified by being capitalized, however this may not always be the case! However, in this example, it is.
Start by looking for nouns - this sentence contains two, Carlene and sandwich. A sandwich is a common noun because it is generic, whereas Carlene is being specific - we're talking about a particular girl who happens to like sandwiches. Therefore, "sandwich" was the common noun in this sentence.
Hope this helps!