Suppose that you test a hypothesis whether the population mean values of two independent groups (group 1 and group 2) are different. You use = 0.05 and the p-value is 0.01. This result implies that:

A. this hypothesis testing is invalid.

B. the mean values of the two groups are significantly different at = 0.05.

C. this hypothesis testing is inconclusive.

D. the mean values of the two groups are not significantly different at = 0.05.