Step 1: Understanding the Question:
This question tests knowledge of flowering induction in pineapple.
Step 2: Detailed Explanation:
Ethylene is used to induce flowering in pineapple.
In practice, ethephon (ethylene-releasing compound) is sprayed to promote flowering.
Abscisic acid (A): Does not induce flowering in pineapple.
Gibberellins (B): Promote stem elongation, not flowering in pineapple.
Brassinosteroid (C): Not used for pineapple flowering.
Thus, ethylene induces flowering in pineapple.
Step 3: Final Answer:
Thus, ethylene induces flowering in pineapple, which corresponds to option (D).
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