"A.Clear Skies" is the correct answer. This phrase is often used to imply that there should be no issue going forward with a certain task or event. It comes from the lingo of pilots and sailors. 
        
             
        
        
        
A, c, d. A becuase it makes clarity. C becuase youre instructions entertainment and so on may be included while you listen. D because it causes better comparrison between what you and the other person think/ say.
        
             
        
        
        
Answer:
"Strike matches on rough surface found on the outside of the box. Do not touch flame, the head of the match, and please keep away from children"
Explanation:
The first two sentences feel like common sense, so I would not include them. The middle sentence is descriptive and I would keep it. The last three sentences can be combined to make the sentence less wordy and read easier. Hope that helps somewhat!