On its December 31, 2020, balance sheet, Red Corp. reported a short-term investment in equity securities, under the fair value through net income model, at $ 330,000. At December 31, 2021, the fair value of the securities was $ 350,000. What should Red report on its 2021 income statement as a result of the increase in fair value of the investments during 2021?

A) $ 0.

B) loss on investments of $ 20,000.

C) unrealized gain of $ 20,000.

D) investment income of $ 20,000.