Kínní ọ̀rò ìșọ̀kan nínú ìpẹ̀yà yìí: Bí ọmọdé bá mọ̀wé, kó má mọ̀ ọ̀nà àtàwọn àgbà, ó yẹ kí ó fi ọwọ́ bọlẹ̀ fún wọn.

This question tests recognition of the pronoun that refers back to the subject already introduced earlier in the sentence, maintaining grammatical agreement across the clauses of the proverb.

The proverb begins by naming the subject, a child, in the phrase describing a child who is literate but does not know the ways of elders. In the clause that follows, advising that such a person should show respect by prostrating, the sentence no longer repeats the word for child; instead it uses a short pronoun standing in for that same subject. That pronoun is the word that ties the second clause back to the person introduced in the first, which is exactly what grammatical concord requires: a later reference must match, in person and number, the subject it stands for.

The remaining options are not concord words at all: one is the phrase describing the elders' ways, one is a subjunctive marker introducing what should happen, and one is the verb for being literate, so none of them performs the pronoun's job of referring back to the subject.

When asked to find a concord or agreement word in a Yoruba sentence, look specifically for the short pronoun that stands in for a noun already mentioned, rather than for descriptive phrases or verbs nearby.