CMA 694 1-13: what do you call the movement along the demand curve from one price-quantity combination to another?

Change in demand.

A - Change in demand.
Demand changes with price.
The demand curve shows that the higher the price, the lower the demand and the lower the price the higher the demand.
This is known as change is demand.

Option C cahnge in quantity demanded is correct. The demand curve shows what quatity is demanded at what price. When there is a change in price there is a change in quantity demanded. When there is a change in any3rd factor then there is cahnge in demand.

Answer (C - Change in the quantity demand) is correct.
The demand curve represents the relationship between the prices of a commodity and the quantity demanded at those prices, holding other determinants of the quantity demanded constant.
Movement along a demand curve reflects a change (increase or decrease) in the quantity demanded.