If you accept either C or D as the correct revision then you have to accept both of them. Hence the best way to treat the sentence is to ignore both of them.
B is not correct either. You can over punctuate. 
That leaves A. 
Sometimes the right answer to many things is to do nothing. My dad used to say "Don't fix what isn't broke." 
A is the answer <<<<<
 
        
                    
             
        
        
        
When proofreading, you should look for CUPS.  
C - Capitalization. 
U - Usage.  (Check word usage, most commonly the subject-verb agreement.)
P - Punctuation. (Check the usage of commas, periods, semicolons, etc.)
S - Spelling. 
I hope this helps!!
It would be much appreciated if you could mark me brainliest :-)
 
        
             
        
        
        
B because the reader can infer that it just seems like he dying but not actually
        
                    
             
        
        
        
Answer:
UNDERSTAND THE ESSAY PROMPT.
CREATE A THESIS STATEMENT.
MAKE AN ESSAY OUTLINE.
BEGIN WITH THE BODY, NOT THE INTRODUCTION.
START EACH PARAGRAPH WITH A TOPIC SENTENCE.
USE CREDIBLE SOURCES.
DON'T FAKE IT.
CONCLUDE YOUR ESSAY.
Explanation: