Antisenescent polyhormone is represented by:

✅ Explanation:
Cytokinins are plant hormones that promote cell division and growth. They also play a crucial role in delaying senescence (the aging process) in plants. This is why they are often referred to as "antisenescent" hormones.

📌 Other Options Explanations:
-Option A: Auxins: Auxins are primarily involved in promoting cell elongation and various aspects of plant growth and development, such as root initiation and apical dominance. While they influence plant development,
-Option C: Gibberellin: Gibberellins are plant hormones that stimulate stem elongation, seed germination, and flowering. They play a role in growth and development
-Option D: Ethylene: Ethylene is a plant hormone associated with fruit ripening, senescence, and abscission (the shedding of leaves, flowers, and fruits). It actually promotes senescence rather than delaying it.