Which of the Following Would Be Considered Support for the Hypothesis

Multiple Choice

Which of the following would be considered support for the hypothesis tested by the scientists?

A) College students produce more carbon dioxide when they yawn more frequently.
B) College students yawn with the same frequency regardless of carbon dioxide levels.
C) College students yawn more when they are in lecture,compared to when they are in lab.
D) College students yawn more when they are exposed to higher levels of carbon dioxide.