Directions: Read the following information and answer the question that follows.

In a certain society, there are two marriage groups; red and brown. No marriage is permitted within a group. After marriage, males become part of their wives' groups; women remain in their own group. Children belong to the same group as their parents. Widowers and divorced males revert to the group of their birth. Marriage to more than one person at the same time and marriage to a direct descendant are forbidden.

Which of the following is not permitted under the rules as stated?

Option A: A brown male marrying his father's sister - his father's sister would be brown (same group as father), so this is NOT permitted (marriage within group). Option B: A red female marrying her mother's brother - her mother's brother would have the same group as her mother (red), so this would be marrying within the red group, which is NOT permitted. Option C: A widower marrying his wife's sister - the widower reverts to his birth group, his wife's sister is in the wife's group, so they're in different groups - this IS permitted. Option D: A widow marrying her divorced daughter's ex-husband - the daughter's ex-husband reverts to his birth group, which is different from the widow's group - this IS permitted. Option B is not permitted.