The correct answer is imagery. Remember that imagery is figurative language that appeals to the five senses. An image is a description that appealse to the reader's sense of sight, smell, hearing, touch, or taste. In this passage, Eliot is using strong sensory imagery. Among other things, he describes "the smell of stakes" (smell), "the burnt-out ends of smoky days" (sight), "a gusty shower" (sight), the sound of rain "on broken blinds and chimney-pots" (sound). Therefore, the correct answer is imagery.