The correct answer is: B) Rainforest ecosystem.
The Silent Valley Movement was a successful campaign to protect the Silent Valley rainforest in Kerala, India. The rainforest was slated to be flooded by a dam project, but the campaign successfully stopped the project and saved the rainforest.
Sacred groves are areas of forest that are considered sacred by local communities. They are often protected from deforestation and other forms of environmental damage.
Coastal wetlands are areas of land that are close to the coast and are covered by water at high tide. They are important ecosystems that provide a variety of benefits, such as flood protection, water purification, and habitat for wildlife.
Tea estates are plantations where tea is grown. They are often located in tropical or subtropical regions.
The Silent Valley Movement was a significant event in the history of environmental activism. It showed that ordinary people can make a difference in protecting the environment.