Marie Received a Puzzle as a Present for Her Birthday

Multiple Choice

Marie received a puzzle as a present for her birthday.The puzzle has three pegs,and to solve the puzzle a person is required to move nine disks from the centre peg to one of the outside pegs.However,only one disk can be moved at a time,and a larger disk can never be placed on top of a smaller disk.What type of problem is this

A)  problem of arrangement 
B)  problem of transformation 
C)  problem of inducing structure 
D)  ill-defined problem