Which of the following represents an operational definition of memory?

The correct answer highlights an operational definition of memory that provides a clear measure of memory performance. Operational definitions are crucial in research as they translate abstract concepts into measurable variables. In this case, "the accuracy of retelling a story based on correct details" gives a specific focus on how we can measure memory through the quality and correctness of the information recalled. Accuracy indicates not only that something was remembered but that it was retained correctly, thus providing a direct link between the concept of memory and a measurable variable.

Other options lack this specific connection to measuring memory. For example, while counting "the number of items remembered" might suggest memory capacity, it doesn't capture the quality or accuracy of recollection, making it less effective as an operational definition. Similarly, "the time taken to recall information" may indicate how quickly information can be retrieved, but time alone does not measure how accurately or completely the information is remembered. Finally, "the ability to recognize learned information" refers to recognition memory, which is just one aspect of memory and does not address the nuanced details of recall, such as retelling a story with accuracy. Overall, the selected answer offers a robust operational definition that directly assesses memory performance.