Imagine a study on how a new drug affects blood pressure. The researchers will give the drug to 25 people in the study a

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Imagine a study on how a new drug affects blood pressure. The
researchers will give the drug to 25 people in the study and a
placebo to the other 25, and track how blood pressure changes in
participants after receiving the drug.
In which of the following four study designs would you expect
taking the drug to be associated with decreased blood pressure over
time even if the medicine did not actually lower blood
pressure?
Select one:
a. Prescribe the medicine to the 25 people with the highest
resting heart rates at the start of the study.
b. Randomly select 40 people to take the drug, and 10 people to
take the placebo
c. Randomly selecting 25 people to take the drug, and 25 people
to take a placebo.
d. Have 25 people take the drug for the for the first 10 days
then stop taking it, and have the other 25 people not take the
medicine at all.