If you look at option C it says "you can buy right packaging stuff..." That is lacking detail and sounds as if it was written by a 8 year old. Because "stuff" needs to be specified. "Stuff" could mean anything from soap bubbles to quarks and DNA. That is why C should be deleted because it is lacking detail.
"Once upon a time there was a wicked sprite, indeed he was the most mischievous of all sprites." explanation: wicked and mischievous are both adjectives the author uses to describe the character.
