<span> "Some ladies are very stiff about having their servants’ friends in the house overnight." During the Gothic time period, this would have been a common thing and therefore added drama</span>
The answer is A) gradualism.
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.