Respuesta :
The letter that adds suspense and takes the story forward is; B: A plot device
What is a Plot Device?
From the given story online which was a letter written by an unworthy and unhappy friend named Henry Jekyll to Utterson, we can say that the letter is a plot device.
Now, the plot of a story is the list of events that occur throughout the narrative of that story or letter. However, when we talk about a plot device, we are referring to an element in a story that has been put there in order to move the story forward.
In this letter, the plot device was put there to add suspense and to move the story forward.
Read more about Plot of a text at; https://brainly.com/question/635437
