The correct answer is B. Glomus tumor

Correct Answer Explanation

Glomus tumors are tumors of the arterio-venous anastamosis of the digital dermis. They occur most frequently in the nail bed. The commonly have a bluish-red discoloration and may be tender or painful with exposure to heat or cold.

Incorrect Answer Explanation

The other listed neoplasms do not fit the clinical scenario presented.

References

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4498398/