Seasonal Demand Shift for Petrol

Steps:

• Identify the cause: Holidays in August lead to more travel by car.
• Link to economics: Increased travel raises the quantity of petrol consumers want to buy at each price.
• Analyze demand curve: This represents a rightward shift, showing higher demand.
• Rule out supply factors: The change stems from consumer behavior, not production.

Why B is correct:

• A rightward demand curve shift means greater demand at every price, per the law of demand, due to seasonal travel needs.

Why the others are wrong:

• A: Leftward shift indicates decreased demand, opposite of sales increase.
• C: Refinery output affects supply, not the demand-driven sales rise.
• D: Hotel increases relate to travel services, not petrol demand directly.

Final answer: B