Explanation:

- Mizoram: This northeastern state is known for its relatively high literacy rate. The commitment to education has been strong, and the literacy rate reflects this.

- Kerala: Kerala consistently boasts the highest literacy rate in India. The emphasis on education and progressive social policies have resulted in widespread literacy.

- Bihar: This state is considered to have one of the lowest literacy rates in India. Challenges such as poverty and access to quality education contribute to its lower standing.

- None of these: This option suggests considering other possibilities, but when addressing just these states, Bihar is known for its lower literacy rate.

Correct Answer: Option 3 - Bihar