It is also important to understand physical phenomena and their limitations when modeling data. Which of the following are true?

A. Even though hourly temperature fluctuations throughout the day may oscillate for a variety of reasons (wind, cloud cover, etc), the underlying trend is quadratic and using a quadratic model is most appropriate.
B. You can eliminate a small number of non-outlier data points in order to construct a model that has a better fit.
C. At some point, some physical phenomena have limitations that do not fit their mathematical models (i.e. springs have an elastic limit).