Final answer:
Sunny weather represents the independent variable in this case.
Step-by-step explanation:
The kind of variable that sunny weather represents in this case is the A. Independent variable. An independent variable is the variable that is manipulated or changed in an experiment, while the dependent variable is the variable that is observed or measured to see if it is affected by the independent variable. In this case, the temperature is the independent variable, while the purchases of frozen yoghurt are the dependent variable.