Temperature is
variable and
the amount of sugar in the solution is the
variable.

Temperature is the independent variable and amount of sugar in the solution is the dependent variable.

Explanation:

Dependent variable is defined as the variable whose value changes with respect to any other variable.

Independent variable is defined as the variable which remain as such and has no effect on the change of another variable. For Example: Time

Solubility is a property of substance to interact with the solvent particles. Thir property is dependent on temperature.

As, the temperature of the system increases, the solubility of the substance will increase and vice-versa.

Hence, temperature is the independent variable and amount of sugar in the solution is the dependent variable.

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the answer to your question is c