Answer:
all of the above are true.
Step-by-step explanation:
They will rise because people may want the gas to last longer and people might be wanting to buy it more and that will help the owners to earn more.
The purchase plan of buyers an not achieved because they may not be able to buy when they needed it to be bought (If that is what was meant there)
The buyers will compete because if people don't have it they won't be able to drive anywhere which people more often drive to get to places such as stores and work.
Hope this Helps