Final answer:
In the experiment regarding the effect of temperature on the decaying process of apples, the dependent variable is the decaying process of apples, as it's the factor being measured.
Step-by-step explanation:
The dependent variable in an experiment is the variable that is being tested and measured, and it is expected to change as a result of the manipulation of the independent variable. In the experiment question provided, what effect does an increase in temperature have on the decaying process of apples, the dependent variable is the b) Decaying process of apples. This is because the decaying process is what is being measured to see how it is affected by changes in the independent variable, which in this case is the a) Temperature.