for 23. i know the answer is C but am unsure how they got to this conclusion

23. Coy, Inc, initially issued 200,000 shares of $1 par value stock for $1,000,000 in 2014. In 2015, the company repurchased 20,000 shares for $200,000. In 2016, 10,000 of the repurchased shares were resold for $160,000. In its balance sheet dated December 31, 2016, Coy, Inc's treasury stock account shows a balance of: a. $0. b. $40,000. c. 3 100,000. Files. d. $200,000