If Changing the Third Treatment Group from Blue to Purple

Multiple Choice

If changing the third treatment group from blue to purple increases the difference in the purple group's average score from the other two groups, all else remaining the same, what will be the impact on the strength of evidence for finding a difference in the average scores on the three exams?

A) There will be more evidence of a difference.
B) There will be less evidence of a difference.
C) There will be no an impact on the strength of evidence of a difference.
D) There is not enough information to tell.