A mother with blood group A (whose father had blood group O) and a father with blood group B (whose mother had blood group O) have children. What are the possible blood groups and their expected phenotypic ratio among their offspring?

Options:

• A: 100% AB blood group
• B: 50% AB and 50% O blood groups
• C: 25% A, 25% B, 25% AB, and 25% O blood groups
• D: 75% AB and 25% O blood groups

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