Which of the following human activities has been most problematic for wetlands around the world? group of answer choices a) eutrophication caused by humans dumping pollutants into water b) addition of mercury pollutants from electric power plants c) the alteration of ocean current circulation resulting in erosion of wetlands d) boat traffic that cause excess oil and gas to be dumped in waterways e) the draining and alteration of wetlands for agriculture and urban development.