On seeing this horrible sight, their throats became dry and they could not speak. (Complex)

• ক Their throats were dry on seeing this horrible sight in order that they could not speak.
• খ When their throats are dry on seeing this horrible sight, they could not speak.
• গ Their throats are dry on seeing this horrible sight so that they could not speak.
• ঘ As their throats were dry on seeing this horrible sight, they could not speak. ✅ সঠিক উত্তর