In a scientific experiment, you should plot both the experimental data and the theoretical data. If it doesn't seem appropriate to do a linear fit, what should you do regarding adding a trendline?
a. Always add a trendline to experimental data.
b. Never add a trendline to experimental data.
c. Add a trendline only to theoretical data.
d. If it doesn't seem appropriate to do a linear fit, do not add a trendline.