extremely pruritic rash over his knees and elbows which has come and gone for several years

A young man comes to you with an extremely pruritic rash over his knees and elbows which has come and gone for several years. It seems to be worse in the winter and improves with some sun exposure. On examination, you notice scabbing and crusting with some silvery scale, and you are observant enough to notice small “pits” in his nails. What would account for these findings?
A) Eczema
B) Pityriasis rosea
C) Psoriasis
D) Tinea infection

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