(Scenario III) a Follow-Up Study Was Done Using a Human

(Scenario III) A follow-up study was done using a human sample. Instead of chow the human participants were given pre-made meals for the duration of the study. To help prevent the participants from identifying the purpose of the study, they were told to complete the Fatigue Scale (FS) each evening. In this study, Amber was in a high protein /low carb/low fat condition and her classmate, Jeff, was tested in a low protein/high carb/high fat condition. After sharing their experiences with each other they determined that the study was probably about the relationship between diet and fatigue. Amber and Jeff are engaging in:

A) hypothesis-testing.
B) hypothesis-speculating.
C) hypothesis-guessing.
D) hypothesis-determining.