Final answer:
The inability to retrieve information from long-term memory is called forgetting. It encompasses encoding failure, amnesia (either retrograde or anterograde), and interference.
Step-by-step explanation:
The correct answer to the question is d. Forgetting. Forgetting refers to the loss of information from long-term memory and can occur for various reasons, including encoding failure, amnesia, and interference. Encoding failure means that the information was never properly stored in memory, to begin with. Amnesia involves memory loss due to physical or psychological trauma, with retrograde amnesia affecting memories before the trauma and anterograde amnesia preventing the formation of new memories. Interference pertains to situations where one memory competes with or replaces another memory, which is classified as either proactive or retroactive interference.
There are various reasons for forgetting, such as encoding failure, which occurs when information is never stored in memory in the first place, and interference, which happens when old or new information hinders the retrieval of other information.