On Its December 31, 2020, Balance Sheet, Red Corp

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.