Among the choices, I think the best answer to how semantic and episodic memories differ is that one remembers general ideas, and the other remembers specific events. Episodic memory refers to one's memory of his/her experiences of a specific event. On the other hand, semantic memories refer to one's memory of facts or general knowledge.
One remembers general ideas, and the other remembers specific events.
Explanation:
Semantic memory falls in the category of explicit memory (or declarative memory). It consists of the general world knowledge a person possesses accumulated through our life experiences.
Episodic memory is the memory of specific event in a person's life.
Let us take an example, from our memories we know what a dog is, this is semantic memory. Now, a person's memory of petting a dog which he/she received on their birthday is an example of episodic memory.
