Answer:
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I would disagree. To read would be considered an infinitive.  The reason why I think the answer is infinitive is because, I know in Spanish, which is similar to English, to do something ( to read) it was always considered an infinitive. It's an action verb. It's not d because there are no other words following the to read. Hopefully this makes more sense.
 
        
             
        
        
        
D: the answer that makes the most sense is gratify
        
                    
             
        
        
        
Hello!
Correct answer is B.) vital signs
Vital signs are measurements of the body's most basic functions
Hope this helps.
 
        
                    
             
        
        
        
Wouldn't the subject be I because it is about you?