an increase in flooding downstream an increase in regional humidity a decrease in the amount of river ecosystems a decrease in the amount of water for irrigation
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The construction of Hoover Dam on the Colorado River resulted in abundant freshwater and electrical power for the region. Which of these is a disadvantage of the construction of Hoover Dam?
Possibilities:
- an increase in flooding downstream
- an increase in regional humidity
- a decrease in the amount of river ecosystems
- a decrease in the amount of water for irrigation

a decrease in the amount of river ecosystems