Step 1: Understanding Ghurye's classification of tribal problems.
G.S. Ghurye, a prominent Indian sociologist, classified the problems of tribes in India into three broad categories: - Economic problems - Social problems - Cultural problems
Step 2: Conclusion.
Ghurye identified three major problems faced by tribes in India, focusing on their economic, social, and cultural challenges.
Final Answer: \[ \boxed{\text{The correct answer is (B) Three.}} \]