Read the following thesis:
A daily glass of pomegranate juice can improve your memory and concentration.
Which evidence below would be the most credible to support this claim?
A)An ad by the Pomegranate Growers Association.
B)The trainer at your gym.
C)An article on healthy eating in the current issue of Self magazine.
D)A 2013 preliminary study at UCLA on the effect of antioxidants found in pomegranates on memory.