Question: If only one predictor x variable is used to predict

If only one predictor (x) variable is used to predict the city fuel consumption, which single variable is best? Why?
Refer to the accompanying table, which was obtained using the data from 21 cars listed in Data Set 14 in Appendix B. The response (y) variable is CITY (fuel consumption in mils-al). The predictor (x) variables are WT (weight in pounds), DISP (engine displacement in liters), and HWY (highway fuel consumption in mi/gal).

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