Frankenstein Chapter 2, Excerpt 2 By Mary Shelley

Victor Frankenstein continues recounting the influences that lead to his great experiment:

An accident again changed the current of my ideas. When I was about fifteen years old we had retired to our house near Belrive, when we witnessed a most violent and terrible thunderstorm. It advanced from behind the mountains of Jura, and the thunder burst at once with frightful loudness from various quarters of the heavens. I remained, while the storm lasted, watching its progress with curiosity and delight. As I stood at the door, on a sudden I beheld a stream of fire issue from an old and beautiful oak which stood about twenty yards from our house; and so soon as the dazzling light vanished, the oak had disappeared, and nothing remained but a blasted stump. When we visited it the next morning, we found the tree shattered in a singular manner. It was not splintered by the shock, but entirely reduced to thin ribbons of wood. I never beheld anything so utterly destroyed.

What has the author done to prepare the reader in this passage?

She has described something wonderful, preparing the reader for a happy story.
She has described something beautiful, preparing the reader for a flowery tale.
She has described something romantic, preparing the reader for a loving exchange.
She has described something terrible, preparing the reader for a tragic event.