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Anup Padwal
Gibberellins break seed dormancy and promote germination. Brassinosteroids, ethylene, and cytokinin, have also been shown to promote seed germination. However, abscisic acid and auxin known to induce and maintain seed dormancy.
the given answer is b. Abscisic acid. Can it be a misprint?
no... if only one answer asked, go for ABA.