Christoper will use the single filing status when he files his $2023$ return. Most of his income is from wages, but he does have a capital gain of $$5,000$ from the sale of stock. He does not have any investment expenses allocable to the capital gain income. If Christopher's adjusted gross income is $$207,000,$ how much of his income is subject to the $3\mathrm{.}8\%$ net investment income tax?

a$.$ $$0$

b$,$ $$2,000$

c$.$ $$5,000$

d$.$ $$7,000$