A partnership has three partners. Partner A has a 50% interest in capital and profits and uses a calendar year end. Partner B has a 30% interest in capital and profits and a May 31 year end. Partner C has a 20% interest in capital and profits and a July 31 year end. What is the partnership's required tax year?

.May 31

July 31

December 31

The tax year that results in the least aggregate deferral of income