Your client Mariella recently donated $1,000$ shares of a publicly traded security to a registered charity. She originally bought the shares for $$20$ per share. When she donated the shares, they were worth $$33$ per share. What amount of capital gain will Mariella be taxed on$?$

a$.$

$$20,000.$

b$.$

$$0.$

c$.$

$$13,000.$

d$.$

$$6,500.$