The correct option is D All the above
Ethylene is a natural plant hormone that aids in fruit ripening. It enhances the respiration rate during the ripening of fruits. The elevation of respiratory rate in fruits during the time of ripening is known as respiratory climactic, which results in the splitting of carbohydrate molecules into simple sugars. The respiratory climactic is found in fruits like apples, bananas, melons, tomatoes, etc. Some changes are associated with the respiratory climactic, which includes color change and sugar release in fruits.