Which of the below prevents a married couple from filing a joint tax return?

I. The spouses have different accounting methods
II. The spouses have different tax years, provided that both spouses are alive at the end of the year
III. One spouse was a nonresident alien for three months during the year, and no proper election was made

a. I and II only
b. II and III only
c. I and III only
d. II only