When Testing for Differences Between Two Groups, If the Computed

When testing for differences between two groups, if the computed z value at 99% confidence is 1.98 we can conclude that:

A) we can reject the null hypothesis that there is no difference between the groups.
B) we can accept the null hypothesis that there is no difference between the groups.
C) there is a statistically significant difference between the two groups.
D) that there is a difference, but not a statistically significant one, between the two groups.
E) we need to run more tests because 1.98 is too close to the 1.96 z-value for 99% level of confidence.