Explanation:

- The sentence discusses the effects of sedimentation in reservoirs caused by dams. This sedimentation affects the distribution of natural resources.

- The correct word should convey the loss or absence of something important caused by sedimentation.

- Option 1: deprived

- "Deprived" means lacking or being denied something.

- This is correct because sedimentation deprives the plains of silt.

- Option 2: distributed

- "Distributed" means spread out or shared amongst an area.

- It doesn't fit because the sentence conveys a lack of silt, not distribution.

- Option 3: destroyed

- "Destroyed" means ruined completely.

- Error as the focus is on the absence of silt, not its destruction.

- Option 4: disabled

- "Disabled" means made unable to function.

- It’s not appropriate as the context is about silt being absent or lacking.