Answer:
The duke's plan for the ornithopter conflicted with that of da Vinci's.
Leonardo da Vinci was a creative genius.
Explanation:
The Ornithopter let's the readers know that the Duke instructed Leonardo Da Vinci, a brilliant engineer and artist to create a tool of war for him "The Ornithopter" and the conflicting thoughts of Da Vinci to make such a weapon for the Duke.
Therefore, the central idea of The Ornithopter is options B and D.
