Provide an appropriate response. 18. A drug company wanted to test a new arthritis medication. The researchers found 80

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Provide an appropriate response.

18. 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 type of experimental design is this?
A.) Group of answer choices
B.) randomized block design
C.) completely randomized design
D.) matched-pairs design
E.) single-blind design