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.
In richard connell's the most dangerous game, there are several words that are not commonly heard in day to day conversation, here are some of the words and it's correct meaning :
Placid : Calm
Doggedly : With determination
Zealous : Extremely Passionate
Scruples : Morals
More information is needed to help answer your question :)
To continue on their journey and not give up