Which of the Following Best Describes the Data Charles Darwin

Which of the following best describes the data Charles Darwin collected, in an effort to show that humans express emotions in similar ways throughout the world?

A) Darwin sent photographs of emotional expressions, posed by people in England, to acquaintances living in places throughout the world, and had the acquaintances ask native people to interpret the meaning of each expression.
B) Darwin wrote to acquaintances living in places throughout the world, and told them to photograph native people's expressions in various emotional situations.
C) Darwin wrote to acquaintances living in places throughout the world, and asked them whether native people express each emotion in a particular way, such as "do people express surprise by raising their eyebrows?"
D) Darwin wrote to acquaintances living in places throughout the world, and told them to ask native people what emotion they were feeling each time they showed a facial expression.