hope
The speaker's mood in the lines "Could I revive within me / Her symphony and song?" is one of hope. Mood is the particular feeling the author creates. These lines begin with the verb phrase "could revive" which indicates that there is a possibility of something happening. This idea of a revival is positive. For these two reasons, we can eliminate astonishment and remorse as possible answer choices. This one line by itself doesn't show love either. Simply because there is no indication whether the symphony and song is one of love for the speaker. Hope is the best answer because of the possibilities that the verb phrase "could revive" opens up.