Answer:
D. A graph showing the increase in jet speeds over time. 
Explanation:
 
        
                    
             
        
        
        
The answer is c the answer is c
        
             
        
        
        
These are two different verbs: one means: to be positioned horizontally (lie) and the other to position something else horizontally, to put something down (lay)
They sound similar and have a meaning connected to being horizontal, that's one reason for their confusion. 
Make sure you also don't confuse their past tenses: 
Lay: laid
lie: lay
Yes, Lay is the present tense of one of them and the past of the other: that's the other reason for their confusion!