Answer : 4. "China"
Explanation :

  Solution: China has the largest weighting on the MSCI Emerging Markets Index, a globally tracked gauge, at about 30%. India is in second place and now has a weighting of 15.5% in the index, while Taiwan has a weighting of 15.11%. India's weight has increased from 12.97% at the end of January. If South Korea transitions from emerging market to developed market category, India's weight could potentially increase to about 18.5%.