The correct option is D Abscisic acid
Abscisic acid (ABA) is the phytohormone responsible for inducing dormancy.
Auxin is responsible for stem elongation, inhibition of lateral buds or maintenance of apical dominance.
Cytokinin is responsible for cell division leading to cell growth, elongation and differentiation. It prevents apical dominance and delays leaf senescence.
Gibberellic acid is responsible for stem elongation, germination, flowering and fruit ripening.