One hormone hastens maturity period in juvenile conifers, a second hormone controls xylem differentiation, while the third hormone increases the tolerance of plants to various stresses. They are respectively

Gibberellin, Auxin, Ethylene

Auxin, Gibberellin, Cytokinin

Gibberellin, Auxin, ABA

Auxin, Gibberellin, ABA

Answer

Gibberellin, Auxin, ABA

Spraying juvenile conifers with gibberellins hastens their maturity period, thus leading to early seed production. Auxin controls xylem differentiation. Abscisic acid (ABA) increases the tolerance ofplants to various kinds ofstresses therefore, is also known as stress hormone.