Is the body mass attributed to non-fat body components, such as bone, muscle, and internal organs.

Lean body mass is the body mass attributed to non-fat body components, such as bone, muscle, and internal organs. In general, lean body mass is the mass of the body excluding the fat. It is important in fitness regimes. Most body builders want to maintain their lean body mass and decrease their body fat. 

If you want the answer you need to post the figure above that it's talking about and you

The answer is option b.