Which Statement Most Accurately Describes the Contributions of Richard Von

Which statement most accurately describes the contributions of Richard von Krafft-Ebing to our understanding of human sexual behavior?

A) Although his opinions and biases had no scientific basis, his views influenced medicine and psychiatry for a long time.
B) He was the first to take a historical approach to understanding particular types of sexual behaviors.
C) By studying sexual behavior across different cultures, he broadened our conception of what is acceptable sexual behavior.
D) He was the first to apply the survey method to sex research.