Answer: d. looking around the house
Explanation: The action that is described in this line from "The Fall of the House of Usher", by Edgar Allan Poe, is Looking around the house. The narrator is arriving to the House of Usher. He was summoned there by Roderick Usher, a school-friend of his. When he sees the house from a distance he looks around the house to watch the effects of time and the gloomy surroundings.