Kínní apẹẹrẹ ọ̀rọ̀ orúkọ tí a fọwọ́ jẹ?

This question tests recognition of a compound noun, a noun formed by joining two or more words into a single naming unit, as opposed to a simple, single-word noun or a verb.

Among the options, a river and a spouse or vehicle are each a single, unanalysed noun, while a word meaning "to know" is a verb rather than a noun at all. The remaining option joins the general word for a vehicle with a second word describing motion by wheel, combining two separate elements into one naming unit for a specific kind of vehicle, a car. That structure, two independent words fused together to name one distinct thing, is exactly what defines a compound noun in Yoruba grammar.

Spotting compound nouns is useful because Yoruba builds a large part of its modern vocabulary this way, joining an existing word to a descriptive term to name something more specific, much as "aṣọ" (cloth) combines with other words to name particular garments.

When identifying a compound noun, check whether a word can be split into two independently meaningful Yoruba words that together narrow down to one specific thing; if it can, it is compound rather than simple.