A. Repeat the same experiment, using 300 men
B. Repeat the experiment giving half of the women water and the other half the energy drink
C. Repeat the experiment giving the women two different energy drinks
D. Repeat the experiment, having half of the women run 2 miles and the other half run 5 miles
Conducting the experiment with half the women taking water and the other half taking an energy drink creates a study and experimental group, which can allow for comparison and conclusion. The researchers can compare the effects of the energy drink directly with a baseline, and this helps to establish a cause-and-effect relationship and provides stronger evidence to support their conclusion.
Therefore, the Correct Answer is B.