Which Change in Sample Selection Procedure for the Study by Christman

Which change in sample selection procedure for the study by Christman et al.titled "Continuous handrail support,oxygen uptake,and heart rate in women during submaximal step treadmill exercise" would have had the greatest impact on increasing the generalizability of the results?

A) Increasing the sample size
B) Including subjects who smoke in the study
C) Having a true control group rather than having subjects serve as their own controls
D) Expanding the sample population to include equal numbers of women who were moderately fit and highly fit

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