A general partnership had the following information at the end of each of the years for 20X0 and 20X1. Current liabilities are $20,000 for 20X0 and $20,000 for 20X1. Long term liabilities for 20X0 of $50,000 and $50,000 for 20X1 and net income(or loss) 20X0 is N/A and 20X1 ($40,000-loss). All liabilities are recourse debt and partner M guaranteed all the long term liabilities. M, a 10% owner, had a $10,000 basis in the partnership at the end of 20X0. M made no contributions or withdrawals during 20X1 or 20X2. How much is M's basis at the end of 20X1? A. $6000 B. $10,000 C. $33,000 or D. $51,000