According to my research it was Lyndon Johnson
All the sentences in a paragraph should be unified and coherent.
Answer: sentences
From the topic sentence to the concluding sentence, they need to be unified and coherent for the writer to truly get their point across as it was intended.
Hope this helps! :)
Irony is definitely the answer to your question.
The correct answer is D. The audience knows something the character or the characters don't.
This is a pretty common literary technique used in plays and its usage goes as far back as Ancient Greece. This is especially noticeable in tragedies where the audience knows what is being plotted while the main characters do not.