In a clinical trial, 780 men suffering from high blood pressure were randomly assigned to one of the three groups. Over a four-month period, the first group received a new drug, the second group received a placebo, and the third group receives no treatment. The diastolic blood pressure of each participant was measured at the beginning and at the end of the period and the change in blood pressure was recorded. The biggest decrease in blood pressure was for those who recieved thelow dosage of the drug. Identify the responsevariable measured.
A)The dosage of the drug
B)The one-month period
C)The treatment received (placebo, low dosage, high dosage)
D)The participants in the experiment
E)Change in diastolic blood pressure