Which of the Following Leads to a Movement Along the Demand

Multiple Choice

Which of the following leads to a movement along the demand curve for spinach but does not shift the demand curve for spinach?

A) A rise in the price of spinach.
B) An increase in the price of broccoli, a substitute for spinach.
C) A newly discovered health benefit from eating spinach.
D) An increase in income for all spinach lovers.