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Katie and Kathy are roommates who share the same bathroom scale. Neither Katie nor Kathy is on a special diet to lose or gain weight. Each morning, they both weigh themselves. From day to day, it seems that each gains or loses two to three pounds. Some days Katie gains three pounds and Kathy loses two pounds. Other days Katie loses two pounds and Kathy gains three pounds. Every day their weights are different from their weights the previous day, and they cannot distinguish a pattern. Katie and Kathy decide to start weighing themselves on a scale at the wellness center. To their surprise, they neither gain nor lose weight from time to time when using the scale at the wellness center. Which one of the following best explains this situation?A. Their home scale has systematic error, and the wellness center scale is more accurate.B. Their home scale has random error, and the wellness center scale is more accurate.C. The scale at the wellness center has systematic error, and their home scale is accurate.D. The scale at the wellness center has random error, and their home scale is accurate.

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