I am a little confused of my homework instructions, they are the following:

Consider the market for scooters(i.e. we are interested in what happens to the market for scooters-and only scooters). FYI: by scooters I mean the gas-powered, low-speed, motorized vehicle.Statewhether the following scenarios would cause an increase or decrease in thedemandfor scooters (i.e.D or D), or an increase or decrease in thequantity demandedof scooters (i.e.Q^D or Q^D).

Each scenario is independent of each other. In addition,your answer cannot be both a change in demand and a change in quantity demanded(it must be one or the other). In each question,show (via a graph)exactly what will happen. Be sure to properly label the axis of your graph and properly label the demand curve.

"If your answer is both a change in demand and a change in quantity demanded, the grade will be ZERO."

This is the sentence above is what I am not sure of, according to this instruction, is the graph I created correct or not? If someone can guide me on the answer I provided, it would really really help me and I'd really appreciate it! :)

a) "The price of a bicycle falls"

Can someone explain me how would the graph look like for another scenario:Citing rising obesity rates, people now opt to walk instead of driving a scooter