Students working on plant extracts want to test the hypothesis.Extracts of Bougainvillea flowers are effective in reducing symptoms of acne in teenage girls.The students are denied permission to conduct such an experiment for ethical reasons. What is the most likely reason for being denied permission?

The experiment would test a plant extract on teenage girls, who are human participants. Research involving people requires safeguards such as informed consent and evidence that the treatment is safe; without these, permission may be denied for ethical reasons. The most likely reason is “humans as test subjects,” not equipment, time, or funding.

AI-written and checked against the verified answer.