Question

do different scents of a brand of dog food affect how much the dog eats? how much the dog eats is the... independent variable dependent variable

Explanation:

In an experiment, the dependent variable is what is being measured or affected. Here, "how much the dog eats" depends on the different scents (independent variable) of the dog food. So it's the dependent variable.

Answer:

dependent variable (corresponding to the purple option: dependent variable)