Hi!
I was wondering the same thing. I feel like the first 6 paragraphs are quite objective since it doesn't really show positives nor negatives. However, I feel that the last paragraph really shows the author supporting or defending Petrie's work in eugenics. Since everything was quite neutral prior, and this last paragraph showed the author defending Petrie's work, I felt that C was a stronger choice than D.
I'm wondering where my reasoning is flawed?
Thanks so much!!