The act of inflecting or the state of being inflected.

Alteration in pitch or tone of the voice.

Changing the tone can make a phrase mean different things. Such as the phrase Oh Baby. Said one way, it indicates happiness, but with a different inflexion it can indicate sadness.

If you were only given a choice of the words you listed, connotation would be the closest. it means.

Something, such as a feeling, thought, or idea, associated in one’s mind or imagination with a specific person or thing: association, connection, suggestion. See suggest

That which is signified by a word or expression: acceptation, denotation, import, intent, meaning, message, purport, sense, significance, significancy, signification, value.