A Set of Data Has a Mean of 12 and a 95

Multiple Choice

A set of data has a mean of 12 and a 95% confidence interval of 10-14. What does this mean?

A) the standard deviation will be 14-10, or 4
B) you can be 95% sure that 12 is the population mean
C) in order for the mean to be significantly different fro some other mean, the scores producing the other mean cannot be between 10 and 14
D) you can be quite sure that the population mean falls somewhere between 10 and 14