The correct option is Maharashtra.
Explanation
States in India have begun recognizing important species of flora and fauna as state symbols to promote biodiversity conservation and public awareness about wildlife.
- Arunachal Pradesh:
Arunachal Pradesh has rich butterfly diversity but was not the first state in India to declare an official state butterfly. - Himachal Pradesh:
Himachal Pradesh has designated various state symbols but it was not the first state to officially declare a state butterfly. - Karnataka:
Karnataka also hosts numerous butterfly species but was not the first state to designate one as a state butterfly. - Maharashtra:
Maharashtra became the first state in India to officially declare a butterfly as its state butterfly. The species chosen was the Blue Mormon (Papilio polymnestor).
Key Takeaway: Maharashtra was the first Indian state to designate a state butterfly, selecting the Blue Mormon as its official state butterfly.