Karl's Keychain Company produces keychains that sell in its stores for $1 each. On January 1, 2015, the company had inventory of 10,000 keychains. During 2015, the company sold 900,000 keychains. At the end of the business year on December 31, 2015, the company's inventory of keychains was 6,000. How much did Karl's output contribute to GDP in 2015? O a. $900,000 O b. $896,000 O c. $906,000 O d. $904,000 X Incorrect