Answer: Both A and C
Explanation:
The Phil's filling gas station operates on a highway was solo in that area and had no other gas stations nearby.It enjoyed the profit .
Sooner a new gas station opened near Phil's gas station.The profit of the Phil's gas station started decreasing. This was because the it has to lower prices to increase its demand and as there were substitutes available in the market now, people moved to another gas stations for their need.
Both of the cases will decrease its profit.