Explanation:

- Option 1: Bihar

- Bihar had the lowest literacy rate according to the 2011 Census of India.

- The state's literacy rate was around 63.8%.

- Option 2: Maharashtra

- Maharashtra had a relatively high literacy rate in 2011.

- It is among the more literate states due to its urban centers like Mumbai and Pune.

- Option 3: Arunachal Pradesh

- Although Arunachal Pradesh has improving literacy rates, it wasn't the lowest in 2011.

- The state's literacy initiatives have progressed over the years.

- Option 4: Kerala

- Kerala is known for having the highest literacy rate in India.

- In the 2011 Census, Kerala's literacy rate was over 93%.

Correct Answer: Option 1: Bihar