In winter, the weather is too cold for the migratory birds to live in the north. (it complex)

• ক In winter, the weather so cold that the migratory birds could not live in the north.
• খ In winter, the weather is so cold that the migratory birds cannot live in the north. ✅ সঠিক উত্তর
• গ In winter, the weather was very cold that the migratory birds could not live in the north.
• ঘ In winter, the weather is cold enough that the migratory birds cannot live in the north.