The day marcus delivered his speech about the dangers of paparazzi stalking celebrities was also the anniversary of the death of princess diana. marcus decided to mention this in his speech introduction. what introductory device was marcus using?

The correct answer is "Reference to a historical event".

In making an introduction, many writers use different writing styles such as a short story, definition of terms, or a question. In this introduction, Marcus used a historical reference and may also use it as a connection to his speech to catch the audience's attention.