Explanation:

- Option 1: Tripura

- Tripura is a northeast Indian state. Although progressive in many areas, it was not the first state to implement the 10% reservation for the economically weaker sections.

- Option 2: Madhya Pradesh

- Madhya Pradesh is a central Indian state. While it has implemented various reservations, it was not the forefront in adopting this particular reservation.

- Option 3: Gujarat

- Correct Answer: Gujarat became the first Indian state to implement the 10% reservation for the economically weaker sections in January 2019. This move was aligned with the central government's amendment to provide reservation to economically weaker sections of the society.

- Option 4: Odisha

- Odisha is an eastern Indian state. It took steps toward reservations but adopted this specific measure later than Gujarat.