The correct option is B All of the above
Ethylene affects the shoots in various ways. Sometimes, buds in a plant may get dormant because of unfavorable environmental conditions. Ethylene can help break this dormancy. It can break the dormancy of the buds in potato as well and promote their growth causing sprouting of potato tubers. The ethylene present in the deep water rice plants promotes the elongation of internodes so that the leaves and upper parts of the plant remain above water. Hence, all of the given options are correct.