The Weight Losses for Participants in a Large Exercise and Diet

The weight losses for participants in a large exercise and diet study vary according to a Normal distribution with mean 14.5 pounds and standard deviation 3 pounds.
Approximately what range covers the middle 95 percent of the weight losses?

A) 11.5 to 17.5 pounds
B) 8.5 to 20.5 pounds
C) 5.5 to 21.5 pounds
D) 0 to 9 pounds