In a Clinical Trial, 780 Participants Suffering from High Blood

In a clinical trial, 780 participants suffering from high blood pressure were randomly assigned to one of three groups.Over a one-month period, the first group received a low
Dosage of an experimental drug, the second group received a high dosage of the drug, and the
Third group received a placebo.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.Identify the response variable measured.

A) Change in diastolic blood pressure
B) The treatment received (placebo, low dosage, high dosage.
C) The participants in the experiment
D) The dosage of the drug