Someone plz help me 
A.a
B.b
C.c
Or
D.d
                                             
                                          
                                          
                                        
											 
											HERES UR ANSWER
ITS OPT A)a
BECAUSE IT GOES THE HIGHEST TO THE LOW
SO GET MORE POTENIAL ENERGY
I LOVE ROLLER COASTERS ⊂( ¬ - ^ ⊂)