Sophisticated diction uses which of the following kind of vocabulary words?

A. colloquial

B. simple

C. adjectives

D. difficult

Sophisticated diction uses D. difficult words. Sophisticated diction includes the usage of elevated and complicated words so as to convey a professional message of some sort. Colloquial vocabulary is used in everyday speech, adjectives can be used in any type of diction, and simple speech is also reserved for everyday speech usually.