The first one. The commas are correctly placed. Sorry if this is wrong.
A is the answer because it ends with a question mark and starts with an interrogative word
Well, your cover page is very creative, while the original is kind of bland. Yours also shows all of the different traits that the characters have in the story, while the original does not. It could use a bit more color, but otherwise it's pretty good.
1)Averages could be done.
<span>2)Experiments or "works" could be repeated many times. </span>
<span>3)Limiting factors likely to introduce errors could be avoided.</span>
