use the paragraph to answer the question. Go-well vitamins are made especially for teenagers. They make your skin shiny and clear. Mrs. J. Rice reports that her daughter's skin has improved dramatically, thanks to Go-well Vitamins. "I love what Go-well has done for me," Lily Rice confirms. Go-well is making teens happy throughout the Midwest. Bottles are flying off the shelves. Why is the claim about the vitamins unsupported by sufficient evidence?

a. the passage centers on a personal testimonial
b. the passage includes references to scientific research
c. the passage uses a figure of speech in the last line
d. the passage includes references to emotions

The claim about the vitamins being unsupported by sufficient evidence because the passage centers on a personal testimonial from one person, Mrs. J. Rice, and her daughter Lily Rice. There is no mention of any scientific research or objective evidence to support the claim. Additionally, the last line about bottles flying off the shelves is a figure of speech and does not provide any concrete evidence of the vitamins' effectiveness. The passage also does not include specific references to emotions. Therefore, the correct answer is a. the passage centers on a personal testimonial.