Ask her teacher and friends for help preparing for the paper.
Answer:
D. clinical trials, doctor's recommendation, and quality control
Explanation:
The correct answer is A.
Your friend directly tells you to buy a product because of how good it is. This would be an example of a direct influence because he is telling you to your face to buy it. The other options would be indirect influence as you either overheard or read about his opinion on this product.
I would say A. Is Joe nearsighted or farsighted?