Read the example sentence, and study the chart of prefixes.When Mr. Goggin read the story, he was very monotone, but I think that was intentional.PrefixDefinitionomni-manynon-withoutmono-singlemicro-small

The prefix “mono-” means “single,” and “tone” refers to the quality or pitch of a voice. So “monotone” means having one tone, which matches choice C; it does not mean having no voice or many different tones.

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