Final answer:
All metaphors provided (I, II, and III) together reflect a complex and respectful attitude towards racehorses, blending awe for their power with an understanding of their physical limits.
Step-by-step explanation:
The metaphors provided that reflect the speaker's attitude toward racehorses are:
- "one of God's most impressive engines" (lines 1-2) implies admiration and awe for the power and grace of the racehorse.
- "paradox of mass and lightness" (lines 7-8) captures the conflicting physical attributes of the racehorse, combining the idea that it is both solid and yet capable of swift, graceful movement.
- "structural limits of bone and sinew" (lines 12-13) recognizes the physical realities and limitations of the animal's strength.
All three metaphors work together to create a composite picture of the racehorse that is complex and filled with respect, emphasizing both its physiologic majesty and its mechanical limits. Therefore, the answer that includes all three metaphors, option (E) I, II, and III, is correct.