AIIMS 2018 Botany Plant Hormones MCQ Question

Option B is correct because it identifies the class of natural hormones to which IAA (indole-3-acetic acid), GA₃ (gibberellic acid), and ABA (abscisic acid) belong, specifically as plant growth regulators that play crucial roles in processes such as cell elongation, seed germination, and stress responses. The other options are not relevant as they do not provide any additional information or context regarding the classification or functions of these hormones, which are essential for understanding plant physiology and development.