Correct option is D
The correct answer is (d) A unit of measurement of land
Explanation:
• Bigha was a traditional land measurement used in colonial India.
• Used for assessing plantation size and revenue collection.
• Its value varied across regions of India.
Information Booster:
• British used local land units for easier revenue administration.
• Indigo and tea plantations relied on such measurements.
Additional Knowledge (Incorrect Options):
(a) A revenue estate
• Refers to zamindari or mahal, not bigha.
(b) A plant that replaced indigo
• Indigo was replaced by synthetic dyes.
(c) An agreement with ryots
• Agreements were called tinkathia or contracts.