Correct Answer: B
Explanation:
Only II must be true. Since seven puppies are brown, the one non-brown puppy could be either one of the males or one of the females. Therefore, I (All or the females are brown) is not necessarily true. Or the one non-brown, so III (Three of the brown puppies are male) is not necessarily true. If four puppies are spotted, even if all three males are spotted, the fourth spotted poppy would be female. So only II must be true.