According to the 2011 Census, Mizoram has the distinction of being:

The correct answer is: b) The state with the highest literacy rate.

Mizoram has the distinction of being the state with the highest literacy rate in India. According to the 2011 Census, the literacy rate in Mizoram was 91.3%, which is significantly higher than the national average of 74.04%. This is due to a number of factors, including the state’s strong focus on education and the high value placed on education by the Mizo people.

The other options are incorrect for the following reasons:

• a) The least populous state in India is Sikkim.
• c) The state with the highest female sex ratio is Kerala.
• d) The state with the highest population density is Delhi.