Correct Option: C. An increase in the number of charging stations Detailed Explanation: To understand why option C is the correct answer, we need to analyze how demand works in economics and how various factors can influence it. Demand refers to the quantity of a good or service that consumers are willing and able to purchase at different prices. Several factors can shift the demand curve for a product, including consumer preferences, income levels, the prices of related goods, and the availability of complementary goods. Why Option C is Correct:

1. Increased Accessibility: An increase in the number of charging stations makes electric cars more convenient to use. If consumers know they can easily find a place to charge their vehicles, they are more likely to consider purchasing an electric car. This increased accessibility can lead to a higher demand for electric cars.
2. Reduction in Range Anxiety: One of the significant barriers to the adoption of electric vehicles (EVs) is "range anxiety," which is the fear that a vehicle has insufficient charge to reach its destination. More charging stations alleviate this concern, making consumers more comfortable with the idea of owning an electric car.
3. Positive Consumer Perception: The presence of more charging stations can also signal to consumers that electric cars are becoming more mainstream and accepted. This can enhance the overall perception of electric vehicles, further increasing demand.

Why the Other Options are Wrong or Weaker:

• Option A: A rise in the price of gasoline
• While a rise in gasoline prices might make electric cars more attractive (as they are generally cheaper to operate), it does not directly increase the demand for electric cars. Instead, it may shift demand from gasoline cars to electric cars. The demand for electric cars may increase as a result, but this is an indirect effect rather than a direct increase in demand.
• Option B: A decrease in consumer income
• A decrease in consumer income typically leads to a decrease in demand for normal goods, including electric cars, which are often considered luxury items. When consumers have less disposable income, they are less likely to make significant purchases, such as a new car, especially one that may have a higher upfront cost compared to traditional gasoline vehicles.
• Option D: A decrease in the price of traditional gasoline cars
• A decrease in the price of traditional gasoline cars would likely lead to a decrease in the demand for electric cars. This is because consumers may opt for the cheaper gasoline cars instead, especially if they perceive them as having similar utility or performance. The lower price of gasoline cars makes them more attractive, which can shift demand away from electric vehicles.

Summary of Key Points:

• Demand for electric cars increases with more charging stations due to improved accessibility and reduced range anxiety.
• Rising gasoline prices may shift demand from gasoline cars to electric cars but do not directly increase electric car demand.
• Decreased consumer income generally leads to lower demand for normal goods, including electric cars.
• Lower prices of traditional gasoline cars can decrease the demand for electric cars as consumers may prefer the cheaper option.

Revision Summary:

• An increase in charging stations directly increases the demand for electric cars by enhancing convenience.
• Gasoline price increases may shift demand but do not directly increase electric car demand.
• Lower consumer income typically reduces demand for electric cars.
• Cheaper gasoline cars can divert demand away from electric vehicles.