Answer:a) long-term memory and sensory memory
Explanation:long term memory can be fragmented and be reconstructed over time because as the time passes the person doesn't actual remember the details as they were.
Even though a person may remember what might have happened but it will not be an exact memory or details of what real happened then and over time this may be influenced by external factors .
Sensory memory are short term memories only occured as the first encounter and quickly disappear for example one might have seen a particular bird pass by but over a period of time they will forget they saw that bird or one might have smelled a particular smell but they will quickly forget it .