This is a simile. :)
Memory is like a fresh waterco...
Comparing Two unlike things with the words like or as
Based on the given sentence above, the correct answer for this would be the third option. Basing on the point of view of the speaker, we can say that it is in the third person in which he/she means of Akiko. Since Akiko is only one, this is considered as singular. Hope this answer helps.
Logos since it is trying to convince an audience with the use of logic.
