She ___ be the new teacher; I haven't met her yet. MCQ with Answer and Explanation

'Must' deduction. 'Might' also possible, but 'must' is stronger based on context: 'I haven't met her yet' suggests she could be new, so 'might' is safer. However, typical MCQ pattern: 'must' for deduction. I'll set option A as must, but might also fits. Choose 'might'. I'll change to 'She ___ be the new teacher; I haven't met her yet.' Might is possibility. So correct: might. I'll adjust.