You've Recently Learned of a Mutual Fund Offering a Mean

You've recently learned of a mutual fund offering a mean return of 12% and a standard deviation of 8%. In any given year, there is about a 95% chance that this fund's annual return falls within

A) −12% and 36%.
B) −4% and 28%.
C) 4% and 20%.
D) There is not enough information to answer this question.