Their daughter was most likely less than 3 years of age at the time of the trip to Disney World.
Step-by-step explanation:
Disney World is a place of entertainment. Rebecca and John decided to visit Disney World with their daughter to have a wonderful time. Two years later, John and Rebecca asked her daughter whether she remembered her visit to the Disney World. She answered no, because she was less than three years of age at the time of visit to the Disney World.
The kids of 2-3 years of age can remember the things only for short period of time. As they grow old their autobiographical memories will automatically lost.