The correct option is B Arunachal Pradesh
Arunachal Pradesh has been officially declared Open Defecation Free (ODF) and has become the second state in the North East after Sikkim to achieve the status. On 1st January 2018, Upper Subansiri, Siang and Changlang were officially declared ODF. The project undertaken under Swachh Bharat Mission (Gramin) SBM (G) saw the light of day only after the state government extended an incentive of Rs 8,000 per toilet. This is in addition to the Centres support of Rs 12,000, raising the grant for constructing a toilet to Rs 20,000. The state government also launched Swachh Arunachal Mission on October 2, 2017 at Tawang which envisaged the Swachh Protocol (Cleanliness Protocol) aimed at ensuring sustainability of assets created under SBM (Gramin). The state has achieved the ODF status before the national target, which is October 2019.