Answer:
C
Explanation:
Substitute goods are goods that can be used in place of each other by consumers.
If the price of bicycles declines, there would be a movement down along the demand curve for bicycles.
The decrease in the price of bicycles leads to a shift in the demand curve for skateboards and not a movement along the demand curve for bicycles.
If the price of bicycles decreases, consumers would increase their demand for bicycles and demand less of skateboards. This would lead to a leftward shift of the demand curve for skateboards or a decrease in the demand curve for skateboards