The best answer — and correct answer — is: [C]: "objective" .
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Nigerian storytelling has historically been an oral tradition. Historically the stories were passed down and told by word of mouth, spoken rather than written.
If the title is "After Hours in Kindergarten" then the theme is about what goes on in a kindergarten's experience while in school. It provides the theme and tells you what you’ll be reading about.
Calamitous means the same as unfortunate. It’s definition is catastrophic or disastrous.