Correct Answer: (e) Greater Mumbai & New Delhi
Solution:As per the question period, only Mumbai was among the 10 most populous cities/UAs in the world. But at present, both Mumbai and Delhi are among the 10 largest cities/UAs of the world in terms of population. According to the United Nations' "World Urbanization Prospects: Revision 2018", the top 10 cities/UAs in the world in descending order in terms of population are as follows: Tokyo, Delhi, Shanghai, Sao Paulo, Mexico City, Cairo, Mumbai, Beijing, Dhaka, and Osaka.