B. the speed of the water
Explanation:
The independent variable here is the speed of the water being poured through the tube.
An independent variable is the variable is the whose change does not rely on another.
- The speed of the water is the cause of the sand deposition.
- This is the independent variable.
- The quantity of sand that is deposited is the dependent variable.
- It relies on the speed of the water.
- The dependent variable is the effect of the speed of water being poured.
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