Which of the following could be the null hypothesis for a t-test of two independent samples from two populations, Group A and Group B?

	A.	There is a difference between the means of Groups A and B; the two means are not equal.
	B.	There is not a difference between the means of Groups A and B; the two means are equal.
	C.	The mean of Group A is greater than the mean of Group B.
	D.	The mean of Group A is less than the mean of Group B.