I think the correct answer from the choices listed above is the first option. Damming a river for hydroelectric power can harm people living downstream. Hope this answers the question. Have a nice day.
A dam is an artificial barrier that restricts the flow of water downstream and they control flooding and also provide water for irrigation and hydroelectricity purposes.
But st times they may fail as the structures become weaker over time and lead to a catastrophic event may destroy the people that live downstream and thereby affecting their livelihoods and their habitats.
