What does it mean to say that the study does not have a lot of power to past a test of significance:

	a.	There too many people, very small variance, and a small difference in the two group means.
	b.	there are a lot of people, too much variance, or not a big difference between the two group means
	c.	there are not enough people, too much variance, or there is not a big difference between the two group means
	d.	there are not enough people, too much variance and a very big difference between the means