A drug company wanted to test a new indigestion medication. The researchers found 700 adults aged 25-35 and randomly assigned them to two groups. The first group received the new drug, while the second received a placebo. After one month of treatment, the percentage of each group whose indigestion symptoms decreased was recorded and compared. What is the response variable in this experiment?
◦ the 700 adults aged 25-35
◦ the one month treatment time
◦ the type of drug (medication or placebo)
◦ the percentage who had decreased indigestion symptoms