Which of the following are the tobacco producing districts in Bihar?

• A. Vaishali, Muzaffarpur, Samastipur, Munger and Purnia
• B. Saharsa, Champaran, Bhagalpur and Saran
• C. Bhagalpur, Kishanganj, Gaya and Patna
• D. Saran, Bhojpur, Jehanabad and Champaran