A researcher randomly selects a sample of participants from a population with a variance of 4. If the researcher selects a sample of 16 participants with a mean of 12, then what is the mean and standard error for the sampling distribution of the mean?
A. mean = 12, standard error = 2
B. mean = 12, standard error = 1
C. mean = 12, standard error = 0.5
D. There is not enough information to answer this question.