Answer:
d. The partnership must use the "least aggregate deferral" method to determine its taxable year.
Explanation:
The least [tex]\text{aggregate }[/tex] deferral of income may be obtained by multiplying the LCC profit of every member for a year by the [tex]\text{number of months}[/tex] of the deferral which would arise through the selection of a proposed year end.
They must this method as the [tex]\text{partnership}[/tex] does not have any [tex]\text{majority partners}[/tex] and all the principal partners do not have same taxable year. The least [tex]\text{aggregate }[/tex] deferral method determines the required [tex]\text{taxable year}[/tex] of the partnership.
Thus, the correct option is (d).