Answer:
Cognitive hypothesis
Explanation:
Hi! The answer would be Cognitive hypothesis. This is because the cognitive hypothesis refers to a problem-solving behavior in which the individual derives a set of rules (hypotheses) that are then sampled and tested until the one rule is discovered that consistently results in correct solutions to the problem. In this case this happens in the study that the reminiscence bump coincided with periods of rapid change, occurring at a normal age for people emigrating early in life but shifting to 15 years later.