From the data that is given, the variable that is not a control is amount of water. That is option B.
What are variables?
In a research work, variables are known as the data that can take up different values.
From the question, the variables that were represented include the following:
A variable is said to be the control in an experiment when they remain unchanged or unaffected by other variables.
The variable that is not a control is amount of water because which changed from 20ml in pot A to 50ml in pot B to 80 ml in pot C.
Learn more about variables here:
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