Final answer:
The imagists would have disliked the sentiment of remembering someone who has left in the excerpt from Christina Rossetti's poem.
Step-by-step explanation:
The aspect of this excerpt from Christina Rossetti's poem 'Remember' that the imagists would have disliked is option D, the sentiment of remembering someone who has left. The imagists, who were a group of poets in the early 20th century, focused on using precise and concrete language to create vivid images. They believed in portraying the world as it is, without sentimentality or nostalgia. The sentiment of remembering someone who has left can be seen as overly emotional and not aligned with the imagists' emphasis on objectivity and observation.