Final answer:
An increase in the price of grapes would be shown as the demand curve shifting to the right. Therefore correct answer is option d.
Step-by-step explanation:
When there is an increase in the price of grapes, it is reflected in the dynamics of the demand curve within the framework of basic economic principles. Contrary to option "d," which suggests a rightward shift, an increase in price actually triggers a decrease in demand. This downward shift manifests as a leftward movement of the entire demand curve, signifying a reduced quantity demanded at every price point.
The law of demand dictates that as the price of grapes rises, consumers are generally inclined to purchase less, thus causing this leftward shift. On a graphical representation of the demand curve, this alteration implies a diminishing consumer willingness to buy grapes across the price spectrum. Conversely, an increase in demand, as suggested by a rightward shift, would occur if external factors such as popularity or health trends enhance consumer preference for grapes, leading to an augmented quantity demanded at each price level.
Understanding these directional shifts in the demand curve is pivotal in comprehending market dynamics and consumer behavior in response to changing prices.