Which of the following hormones increases when plants are flooded?

Question

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When plants are flooded, the hormone that increases is ethylene. Ethylene is a gaseous hormone that triggers various responses, such as promoting leaf senescence or fruit ripening, but it is also involved in the response to flooding. In flooded soils, the lack of oxygen inhibits respiration and triggers the anaerobic metabolism of cells, which produces ethylene. This triggers a range of changes in the plant, such as the elongation of stems and aerenchyma formation to improve oxygen transport.

Which of the Following Hormones Increases When Plants Are Flooded