On January 1,2021 , total assets for Wininger Technologies were $138,000; on December 31 , 2021 , total assets were $158,000. On January 1 , 2021 , total liabilities were $113,000; on December 31 , 2021 , total liabilities were $118,000. What is the amount of the change and the direction of the change in Wininger Technologies' stockholders' equity for 2021 ? A. decrease of $25,000 B. decrease of $15,000 C. increase of $15,000 D. increase of $25,000