Final answer:
The type of context clue present in the sentence is antonym clue.
Step-by-step explanation:
The type of context clue present in the sentence is antonym clue. An antonym clue provides a word or phrase that is opposite in meaning to the unknown word. In this case, the use of the word 'but' indicates a contrast between the apparent morality of Dianna and her true nature. The word 'iniquitous' serves as the antonym clue, revealing that she is not as moral as she seems.
Learn more about Context Clues