Answer:
A). The first items on the list.
Explanation:
As per the question, 'the items on the first list' are most likely to be recalled or remembered by the people when they are retested after a delay. This effect is characterized as the 'serial-position' effect which states that people are able to remember the first and last items mentioned in the series most effectively while the middle items the worst. This effect is quite often associated with the 'primacy effect' which states that human cognitive abilities tend to recall the 'first items' of the series more frequently and thus, retests would show more results of people recalling 'first items' more effectively. Thus, option A is the correct answer.