Explanation:

Let’s break it down:

- The 30th Surajkund International Craft Mela was held in 2016.

- The Theme State is chosen every year to showcase its culture, arts, and crafts.

- Option 1: Chhattisgarh has been Theme State before, but not for the 30th.

- Option 2: Kerala has been highlighted, but not in 2016.

- Option 3: Telangana was the Theme State for the 30th edition.

- Option 4: Bihar has had its turn too, but not that year.

So here’s the answer: The correct choice is Telangana. This state got the spotlight at the 30th Surajkund Mela, bringing its unique crafts and traditions to the front.