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On January 1,2021 , total assets for Wininger Technologies were $137,000; on December 31,2021 , total assets were $155,000. On January 1 , 2021, total liabilities were $113,000; on December 31 , 2021 , total liabilities were $116,000. What is the amount of the change and the direction of the change in Wininger Technologies' stockholders' equity for 2021? A. decrease of $21,000 B. increase of $15,000 C. decrease of $15,000 D. increase of $21,000