A nutritionist would like to test whether green coffee extract will impact weight loss in middle-aged women. Which of the following is the best hypothesis for the experiment?
a. Middle age women taking green coffee extract pills daily will lose more weight than middle-aged women not taking green coffee extract pills.
b. Women drinking coffee will most likely lose weight.
c. Will green coffee extract help middle-aged women lose weight?
d. Green coffee extract helps people lose weight.