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Answer:
C. Residuals aren't random; linear is not a good fit
Explanation:
The attached graph shows the given points (black) and the best-fit line (red). The residuals are connected by the dashed red line. They are decidedly NOT random. It appears that an exponential fit would work better than this linear fit.
The residual values are not randomly dispersed around the horizontal axis, so a linear fit is not appropriate.