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A new drug to regulate heart rate was tested on laboratory rats over a 24-hour period. As the drug concentration increased from 0 to 10 mg/mL, the average heart rate decreased until it plateaued at 8 mg/mL. Which of the following scientific explanations is best supported by the data?

A.The heart rate remains constant regardless of the drug concentration.B.Increasing the drug concentration beyond 8 mg/mL has no further effect on heart rate.C.The drug is more effective at lower concentrations for heart rate reduction.D.Higher concentrations of the drug are required to achieve any heart rate reduction.

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A new drug to regulate heart rate was tested on laboratory rats over a 24-hour period. As the drug concentration increased from 0 to 10 mg/mL, the average heart rate decreased until it plateaued at 8 mg/mL. Which of the following scientific explanations is best supported by the data?

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