The correct answer is the misinformation effect.
The misinformation effect refers to the phenomenon where long-term memories become inaccurate when misleading information is incorporated to a person's memory of an event, after the event has occurred. In this instance, Alisa was afraid of the roller coaster, however her memory of this was rendered inaccurate after her friend, Abigail, several weeks later, asked her "remember how much fun we had on the roller coaster?". This demonstrates the misinformation effect.