A Drug Company Wanted to Test a New Arthritis Medication

A drug company wanted to test a new arthritis medication. The researchers found 800 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 arthritis symptoms decreased was recorded and compared. What is the treatment in this experiment?

A) the 800 adults aged 25-35
B) the percentage who had decreased arthritis symptoms
C) the one month treatment time
D) the drug