The Distribution of Total Body Protein in Healthy Adult Men

The distribution of total body protein in healthy adult men is approximately Normal with mean 12.3 kg and standard deviation 0.1 kg.
What is the approximate probability that a randomly selected healthy man has a total body protein greater than 12 kg?

A) 0.0013
B) 0.9772
C) 0.9973
D) 0.9987