Answer:
Person versus nature 
Explanation:
"A fierce rain had swollen the middle fork of the Kentucky river." 
 "The brown water overflowed its muddy banks."
And the epilogue - "Not even a flooded river could stand between Mary Breckinridge and the hospital her patients needed." 
The text provides evidence of her going up against the forces of nature rather than the other options.
 
        
             
        
        
        
I think it's C.
Because, lemme put commas on each sentences....
(1) If you ask me, Jerry is a tennis whiz. 
<span>(2) When she is worried, Lucille eats a lot. </span>
<span>(3) Jerry loves tennis, he plays everyday. </span>
<span>(4) Lucille bought a new tennis racket and brought it home. << Where should I put it?
</span>
So, (4) is automatically out of question. (1) and (2) seems okay with comma, but (3) is a little bit weird. (3) supposed to have 'and' in the middle, but it's not there. So, you can put semicolon there, to separate the words. 
        
             
        
        
        
I believe your answer would be D. Taking into consideration that the genre features short texts, while still including all of the features of a full length story. :)
        
                    
             
        
        
        
C. Using vivd language and sensory details to create images.