Concept:An indirect and usually unfavourable remark is known as an innuendo.Explanation:An allusion is an indirect reference to something, but it is not necessarily unfavourable.Irony is a contrast between what is expected and what actually happens.An aside is a remark spoken by a character to the audience, not to the other characters.An innuendo is an indirect remark that carries a negative or insulting meaning.Therefore, the word that fits the definition is innuendo.Answer:D. innuendo