It sounds like Nick is suffering from a infection of some sort. The name of this infection he may be suffering from is onychomycosis.
Answer:
C
Explanation:
If you are 12-17 years old, then this is the answer. Otherwise D if you're 18-40, and B if you're 5-11. Hope this helps.
They have been influenced. By themselves learning they have more to live for or by somebody close to them such as family or an relationship