The Indus Valley civilisation met its decline because of which of the following reasons?

The correct options are
A Increasing population.
B Breakdown of the drainage system.
C Overgrazing.
D Deforestation.
An increasing population made the administration difficult. The garbage piled up on streets and drainage systems broke down. Too much grazing by plentiful herds destroyed the green cover. Increasing demands of wood for fuel led to deforestation.