Answer:
C. Residuals are the different types of treatments.
Step-by-step explanation:
Experiment Design is an approach to reaction and process optimization that allows different factors to be varied at the same time to select the reaction space for optimal values. In other words, it is the organization of the experiment in such a way as to make possible its completion in an organized and controlled manner. Regarding the design of experiments, we can say that the experimental units are the things in which the experiment is performed, the treatment is what is actually done for the experimental units and the levels are different amounts of treatment or factors. However, it is incorrect to state that waste is the different type of treatment.