Final answer:
Retrograde amnesia is an example of forgetting due to being unable to successfully retrieve desired information from long-term memory.
Step-by-step explanation:
The correct answer is d) Retrograde amnesia. Retrograde amnesia refers to the loss of memory for events that occurred prior to brain trauma. It is an example of forgetting due to being unable to successfully retrieve desired information from long-term memory. For example, if someone suffers a head injury and cannot remember their past experiences or events.