Urban weather

The research object of this question is a building, which cannot be used as a reference, so B does not meet the meaning of the question.

The position of the building relative to the ground or the blue sky has not changed. Taking the ground or blue sky as a reference, the building is still, so A and C don't meet the meaning of the question.

Taking the cloud as a reference, the position of the building relative to the cloud has changed, so the building with the cloud as a reference is moving, so D meets the meaning of the question.

So choose D.