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The question refers to the phenomenon of bolting, which is the rapid internode elongation in rosette plants like cabbage and beet just before the reproductive phase (flowering).
Gibberellins are known to induce bolting in rosette plants. By applying Gibberellic acid (GA3), the internodes elongate significantly, allowing the plant to flower.
Option (A) Ethephon is an ethylene source used for fruit ripening. Option (B) Abscisic acid is a growth inhibitor. Option (D) Indole butyric acid is an auxin used for rooting. Therefore, Gibberellin is the correct regulator for internode elongation.
Final Answer: Gibberellin