As a result of an expected increase in the price of gasoline in the near future, the followings are likely effects, EXCEPT: A shift up of the current supply curve for gasoline

All of the effects are likely except the last one. There is no reason for gas prices to decrease today and increase tomorrow.

If gas prices are expected to rise, then it's likely that more will be supplied to the market, so the first answer is true. If you think gas prices are about to rise, you might fill your tank today. That would increase the demand and ake the second answer true. It is possible that some gas stations will raise prices knowing that they will pay more for gas tomorrow, so the third answer could be true. Again, there would be no reason for gas stations to cut their price, so it's the last answer that isn't true.