The Distribution of Vitamin C Amount in Vitamin Drops Produced

The distribution of vitamin C amount in vitamin drops produced by a given factory is approximately Normal, with a mean of 60.0 mg and a standard deviation of 0.5 mg.
What is the approximate probability of drawing at random a vitamin drop with a vitamin content between 60.25 and 60.75 mg?

A) 0.16
B) 0.24
C) 0.38
D) 0.62