Concept:English adjectives follow a fixed order: opinion, physical description, age, then the noun.
Explanation:“Mad” expresses opinion or quality.
“One-legged” gives a physical description.
“Young” indicates age.
Therefore, the correct sequence is: opinion → physical description → age → noun.
This order produces “mad one-legged young man.”
Hence, the best completion is option D.
Answer:D. mad one-legged young man