Step 1: Recall what this technique is.
Bamboo drip irrigation carries water from springs and streams through bamboo pipes straight to the roots of plants, using very little water.
Step 2: Place it geographically.
This method belongs to the hilly, high rainfall tribal areas of Meghalaya, where bamboo is plentiful and crops like betel leaf and black pepper are grown on slopes.
Step 3: Rule out the other states.
Himachal Pradesh and Kerala use different irrigation methods, and Rajasthan is better known for structures like johads and tankas for water harvesting, not this technique.
Hence, the correct answer is option (D) Meghalaya.