Answer: C. Hydroelectric dams
Step-by-step explanation:
The Andes has rivers that supply a significant amount of water and so are ideal for the construction of hydroelectric dams and power stations. More than 200 dams have been planned for the Andes with a lot of those being built already.
Environmentalists worry that this is too many dams to build as they believe that it will reduce the agricultural productivity of the region as it will reduce the amount of sediments being carried by the rivers to other areas.