Answer: D) The partnership must use the "least aggregate deferral" method to determine its "required" taxable year.
Step-by-step explanation:
The Least Aggregate Deferral rule is used when neither of the partners can enforce their taxable year on the others because there is no dominant partner as is the case here because no shareholder has more than 50% ownership and the tax years of the partners are not aligned.
The partnership will have to use the "Least Aggregate Deferral" method when the above happens which is based on the percentage of profits for each partner.