Correct Option: B

In economics, the demand curve is the graph depicting the relationship between the price of a certain commodity and the amount of it that consumers are willing and able to purchase at that given price. The shift of a demand curve takes place when there is a change in any non-price determinant of demand, resulting in a new demand curve. There is movement along a demand curve when a change in price causes the quantity demanded to change. When there is a change in an influencing factor other than price, there may be a shift in the demand curve to the left or to the right, as the quantity demanded increases or decreases at a given price. For example, if there is a positive news report about the product, the quantity demanded at each price may increase, as demonstrated by the demand curve shifting to the right.