I believe the correct answer is A. Gloom and despair are ever present dangers.
Edgar Allan Poe, even though against didactic in literature, in the short story “The Fall of the House of Usher” might want to convey a certain moral message – to be wary of the gloom and despair. In this story, the feelings of the gloom and despair surrounding the property of the Ushers from the very beginning allude on the gloom and the despair inside the Usher twins which will be the death of them.