Read the excerpt from "Safari Day in Kenya.”Kimani stops at a watering hole, where hippos grunt in mud-baths,Baboons play in a nearby tree, like children out at camp.

“Grunt” imitates the low sound a hippo makes, so it is an example of onomatopoeia. The other choices do not best describe this word: the line’s main sound effect is not repeated vowel sounds, repeated starting consonants, or rhyme.

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