What Was a Major Shortcoming of the Work Done by Lombroso

What was a major shortcoming of the work done by Lombroso and his contemporaries?

A) Lombroso contaminated his autopsies with dirty instruments.
B) They did not use a large enough sample size.
C) They believed some traits were the product of genetics when they were in fact the product of a person's environmental conditions.
D) They lacked the high-resolution medical imaging devices needed to identify more subtle physical traits possessed by criminals.