Answer :
Answer:
I think it is b
sorry it took so long I just seen your question
As per the question, the therapist is studying the effect of the meditation and yogi exercises on reducing the stress. He offers a Radom sample of 30 people to his patients and allows them to pick the treatment.
- As the therapist uses a random sample of 30 thus the patients will be able to treatment is more effective and helps directly in reducing the stress levels.
Hence the option B is correct.
Learn more about the therapist is studying the effects of meditation and yoga.
brainly.com/question/21873857.