Concept:Emphatic stress shows a correction or contrast against another word in the question.
The stressed word is written in capital letters to signal this contrast.
Explanation:Here, the stressed word is
STEEL.
So the question must refer to a different material, like plastic.
Option D asks whether Ade's bicycle is made of plastic.
The natural reply to that question is: “No, Ade's bicycle is made of STEEL.”
Therefore, option D produces the correct emphatic response.
Answer:D. Is Ade's bicycle made of plastic?