The correct answer is C. The amount of NaCl dissolved
Step-by-step explanation:
In an experiment, you can identify the dependent variable because this is the factor tested or studied. Also, this variable is affected by the independent variable or factor manipulated by the scientists. This means, in the experiment presented, the independent variable is the temperature as this is manipulated, and therefore the dependent variable is the amount of NaCl dissolved because this depends on the independent variable and it is the main factor that is being tested.