Final answer:
The description of bones clattering appeals to the sense of sound, as the word 'clattered' evokes an auditory image.
Step-by-step explanation:
When the phrase 'the bones softly clattered as they swayed against the rack' is described, it appeals to the sound sense. The word 'clattered' implies a noise made when objects, in this case bones, hit each other or another hard surface. This creates an auditory image for the reader, as they are likely to imagine the specific noise described. Therefore, the correct answer is A) sound.