Correct option is B
Himachal Pradesh has the distinction of being declared India's first carbon-free state, utilizing hydroelectric power extensively for its energy needs.
Arunachal Pradesh: While rich in natural resources and involved in hydroelectric production, it is not declared carbon-free.
Madhya Pradesh: Focuses on solar and other renewable energies but is not carbon-free.
Kerala: Advances in renewable energy, particularly solar, but not officially carbon-free.