The depletion of flora and fauna of a region does not occur due to _______.

The correct option is D Collection of fuel wood by the rural women

• Depletion of flora and fauna of the region mainly occur due to deforestation, which is cutting down trees resulting in the loss of habitat of flora and fauna of the region.
  
• Deforestation is the result of urbanization, spread of agriculture lands, and implementation of multipurpose river valley projects like construction of dams.
  
• But collection of wood for fuel by rural women do not destroy forests as they only collect dry and fallen wooden sticks.