Which of the Following Illustrates Movement Along the Demand Curve

Which of the following illustrates movement along the demand curve?

A) Prices remain the same,but there is a significant increase in demand.
B) Prices remain the same,but there is a significant decrease in demand.
C) As the price is raised,the quantity demanded increases,assuming all demand factors stay the same.
D) As the price is lowered,the quantity demanded increases,assuming all demand factors stay the same.
E) Movement along the curve indicates that some significant event has taken place outside the organization that has affected demand.