The correct answer is D. Melanocytic nevus. 

In green nail syndrome (chloronychia), the nail develops green–black to green–blue discoloration due to pyocyanin, a blue–green pigment produced by P. aeruginosa. Predisposing factors include frequent or prolonged exposure to water, excessive use of detergents and soaps, nail trauma and other causes of onycholysis. The diagnosis of green nail syndrome is usually clinical; if necessary, it can be confirmed by Gram stain and culture of exudate and nail fragments. The differential diagnosis includes a subungual hematoma, melanocytic nevus, melanoma, and Aspergillus infection.

1 – Excessive use of detergents: Predisposing factors for green nail syndrome (chloronychia) include frequent or prolonged exposure to water, excessive use of detergents and soaps, nail trauma and other causes of onycholysis.
2 – Excessive use of soaps: Predisposing factors for green nail syndrome (chloronychia) include frequent or prolonged exposure to water, excessive use of detergents and soaps, nail trauma and other causes of onycholysis.
3 – Nail trauma: Predisposing factors for green nail syndrome (chloronychia) include frequent or prolonged exposure to water, excessive use of detergents and soaps, nail trauma and other causes of onycholysis.
5 – Frequent and prolonged exposure to water: Predisposing factors for green nail syndrome (chloronychia) include frequent or prolonged exposure to water, excessive use of detergents and soaps, nail trauma and other causes of onycholysis.

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