Cities like New Delhi, London and Washington DC are called _____.

The correct answer is Option (2) → Administrative towns/cities

Administrative Towns: National capitals, which house the administrative offices of central governments, such as New Delhi, Canberra, Beijing, Addis Ababa, Washington D.C., and London etc. are called administrative towns. Provincial (sub-national) towns can also have administrative functions, for example, Victoria (British Columbia), Albany (New York), Chennai (Tamil Nadu).