Find out that word, the spelling of which is wrong.

The correct answer is C. Marionette.

A. Melifluence is a word that means “sweetness of speech.” It is spelled correctly.
B. Margarine is a type of spread that is made from vegetable oil. It is spelled correctly.
D. Marvelous is an adjective that means

“causing great wonder or surprise.” It is spelled correctly.

Marionette is a word that means “a puppet operated by strings.” It is spelled incorrectly. The correct spelling is marionette.