Answer: Because it's an icy body and not like the other planets.
Explanation: I hope that this helps you out! Have a good day! 
 
        
             
        
        
        
I believe it is A because the others are run on sentences.
        
             
        
        
        
<span>The comma indicates a pause between parts of a
sentence. It is also used to separate items in a list and to mark the
place of thousands in a large numeral.
So this does not need a comma.
Your answer is A: no comma
</span>
        
             
        
        
        
Answer:
The conversation you write must sound natural for the characters.
Explanation:
More natural conversations between characters make your writing more fun to read. Reading a dialogue that sounds like it could actually happen engages the reader, and creates an investment in the characters themselves. Think of it this way, would you rather watch a movie with good acting or bad acting?