Final answer:
Karen's memory of her snowstorm-affected birthday is an example of an episodic memory, a type of long-term autobiographical memory involving personal events.
Step-by-step explanation:
Karen's vivid memory of the day a massive snowstorm ruined her 16th birthday party is an example of an episodic memory. This type of memory is a form of long-term memory that contains information about events we have personally experienced, also known as autobiographical memory. Episodic memory is a type of declarative memory also. It involves the recollection of visual imagery and the feeling of familiarity with what happened, where it took place, and when the event occurred.