A researcher is performing a two-tailed related samples (matched pairs) t-test. A total of 12 people are in the sample, and before and after measures are taken. The observed t-value for this is –1.84. The level of significance is 0.05. The correct decision is to _______.
选项：

A:do not reject the null hypothesis
B:reject the null hypothesis
C:take a larger sample
D:use the z-table instead of the t-table