Select the best answer On March 1, 20x0, M retired from the MNO Partnership, a calendar-year partnership. M continued to receive retirement payments until February 28, 20xi, when his entire partnership interest was liquidated. For tax purposes, when did M cease to be regarded as a partner? O A. March 1, 20xo O B. December 30, 20XO O C. December 31, 20X1 O D. February 28, 20X1