Concept:Mica production in India is concentrated in a specific belt across the states of Jharkhand and Bihar.
Explanation:The largest producer of mica is Jharkhand.
The major mica-producing states include Bihar, Jharkhand, Andhra Pradesh, and Rajasthan.
The famous mica belt stretches across Koderma, Hazaribagh, and Giridih in Jharkhand, and extends into Nawada, Jamui, and Bhagalpur in Bihar.
Thus, the combined region of Bihar and Jharkhand dominates mica production in India.
Answer:B. Bihar and Jharkhand