Ewo nínú àwọn òro wọnyi ni kiișe òrò? Asopò?

“Abo” means “half” and is a noun, not a conjunction. It names an amount rather than connecting ideas.

The other choices are all conjunctions that join sentences or ideas together. “Abo” stands alone as a quantity word.

Knowing word types helps you use them correctly. Conjunctions connect, while nouns name things.