Kanpur and Lucknow cities of UP became million cities as per the census of India in the year

1. A

   1951 and 1961 respectively

   (a) 1951 and 1961 respectively. Neither Kanpur nor Lucknow had crossed one million by those early Census years.

2. B

   1961 and 1971 respectively

   (b) 1961 and 1971 respectively. Kanpur was still below the million mark in 1961; Lucknow’s million status is later than 1971.

3. C

   1971 and 1981 respectively

   (c) 1971 and 1981 respectively. Census of India records Kanpur as a million-plus city in 1971 and Lucknow in 1981. Official key.

4. D

   1981 and 1991 respectively

   (d) 1981 and 1991 respectively. That pair is one decade too late for both cities’ first million crossing.

Summary. Official key is (c) 1971 and 1981 respectively. Million city means urban agglomeration of ten lakh and above. Kanpur, the industrial leader of UP, crossed first in 1971; Lucknow, the capital, in 1981. Earlier decades under-count; 1981–91 overshoots both crossings.