Which change causes a movement along the demand​ curve?

Therefore, a movement along the demand curve will occur when the price of the good changes and the quantity demanded changes in accordance to the original demand relationship. In other words, a movement occurs when a change in the quantity demanded is caused only by a change in price, and vice versa.

A movement along the demand curve is caused by a change in PRICE of the good or service. A shift in the demand curve is caused by a change in any non-price determinant of demand. The curve can shift to the right or left. the tendency for the quantity supplied of a good in a market to increase as its price rises.

answer: a. the kind of population living in your neighbourhood.

the census explorer data tool by the us census bureau allows the user to zoom in on any neighbourhood within the united states and find the kind of people residing in that by race and age.  

the tool needs to needs to be used twice – once in order to find what type of people reside in a neighbourhood, and then to see the age groups of the people in the same neighbourhood.