Answer:
Nancy's ambient locality might be having more suppliers, higher supply of Gasoline
Explanation:
National average price of gasoline = $3.14
Stations near Nancy's home have an average price = $2.95
Gasoline price near Nancy's house is lesser than national average price level. Number of gasoline stations near her house might be more. It implies increase in its supply. This leads to competition among sellers & reduces the price level.