Q. (21-25) Each sentence has four underline word(s). The four underlined parts of the sentence arc marked a, b, c and d. Identify the one underlined word(s) that must be changed in order for the sentence to be correct. _If_ the air is sufficiently _unstable enough_, the upward currents will draw in warm, _moist_ air and cause water vapor _to condense_ into raindrops.

• ক the upward currents will draw in warm, moist air and cause water vapor
• খ If the air is sufficiently
• গ unstable enough ✅ সঠিক উত্তর
• ঘ to condense into raindrops.