Explanation:

- Option 1: Kerala

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

- In 2011, its literacy rate was over 93%.

- Hence, it’s not the state with the lowest literacy rate.

- Option 2: Andhra Pradesh

- Andhra Pradesh had a literacy rate of around 67% according to the 2011 Census.

- While not the highest, it is not the lowest.

- Option 3: Tamil Nadu

- Tamil Nadu had a relatively high literacy rate of about 80%.

- It ranks among the higher literacy scores.

- Option 4: Bihar

- Bihar recorded one of the lowest literacy rates, at about 63.8%.

- It is the lowest among the given options.

Correct Answer: Option 4 - Bihar

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