The correct answer is D. Difficult
Step-by-step explanation:
In writing and speaking, the diction refers to the selection of words a writer or speaker does in order to convey a main message or idea and that create a style that makes each author unique. Additionally, the diction can be classified as colloquial, technical, sophisticated, etc. depending on the type of words that prevail. In the case of sophisticated diction, this is the diction used in formal contexts in which complex, technical and difficult words prevail, while colloquial, simple words and other such as slangs are avoided. Therefore, sophisticated diction uses mainly difficult words.