Answer:
D. All of these
Step-by-step explanation:
All the statements are true.
Models are simplified versions of an aspect of reality that scientists use to understand a particular problem. Models only include some variables, while others are left out, or held constant.
If a scale model is incorrect, then the actual structure will likely have the same issues as the scale. This is because the actual structure is built upon the model structure.
Finally, a diagram is one example of a model. A diagram analyzes a particular phenomenon, making certain assumptions.