I believe calcium, iron, zinc are 3?
I will go with (C) Missed job opportunities.
Let's evaluate why.
If someone is in a gang be it long term or short term, they probably are not well educated. Therefore they're not going to be able to attend college.
Placing their lives at risk by gang involvement will definitely NOT improve their physical health or decrease their risk of injury. It would most likely do the opposite.
A skill related is fitness including training to improve speed, balance, coordination, power, and finally reaction time.
Hope this helps...