Which of the Following Situations Would Trouble Adam Smith the Most

Which of the following situations would trouble Adam Smith the most?

A) When there is threat to major oil supplies, gas doubles in price, making it unaffordable to the average consumer.
B) Competing oil companies set up gas stations across the road from each other, making consumers choose between the two.
C) Gas prices jump three or four times a day, depending on the price of oil in international markets.
D) Legislation allows stations to change the price of gas only per week to protect consumers.