Answer:
c. November 30
Step-by-step explanation:
Since in the question it is mentioned that the Walnut interest i.e. partnership owned and equaled by Bob, Jon and Gary. In the case of Bob and Job each contains November 30 in term of tax year while for Gary it would be Jan 31
So here the partnership should be adopted as on November 30 because the adoption of the partnership is dependent upon on the majority of the partners.
hence, the correct option is c.