Final answer:
The serial position effect, which describes the tendency to recall items at the beginning and end of a list more easily, is most likely to impact long-term memories of events that occurred a long time ago, as opposed to recent events, emotionally significant events, or events involving complex details.
Step-by-step explanation:
In the context of recalling memories, information likely impacted by the serial position effect is d) Events that occurred a long time ago. The serial position effect refers to the tendency of a person to recall the first and last items in a series best, and the middle items worst. This is relevant for items in a list and may not specifically relate to events that are recent, have emotional significance, involve complex details, or are autobiographical in nature.
Recent events are less likely to be influenced by the serial position effect because they are not part of a list of items learned consecutively. Events with emotional significance are usually better remembered due to the arousal theory, where strong emotions improve memory retention. Events involving complex details require more effort in encoding and might be influenced by how deeply the details are processed but are not specifically related to the serial position effect.