Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

An increase in sample size is most likely to result in a:
Option A:wider confidence interval.
Option B:decrease in the standard error of the sample mean.
Option C:lower likelihood of sampling from more than one population.

Answer: B