The central theme of the passage is the detailed and complex process of extracting indigo dye from the leaves of the Indigofera plant. The passage outlines each step, from harvesting the leaves to soaking, churning, settling, filtering, compressing, and drying, as seen in sentences like "These leaves undergo a process of soaking in water and churning until a navy-blue froth is released" and "The obtained deep blue paste is then subjected to filtration to remove dirt and impurities." The focus is on the intricate steps involved in transforming the leaves into usable indigo dye.
Option (1): While the passage briefly mentions that lime and natural sugars can be added to enhance the process, this is a minor detail and not the central theme. The primary focus is on the overall extraction process, not the specific role of these additives.
Option (2): The passage does not discuss the applications or uses of indigo dye in industries. It focuses solely on the production process.
Option (4): The passage does not describe how the Indigofera plant is grown or its life cycle. It only mentions harvesting the leaves and processing them for dye extraction.
Hence, the correct answer is option (c).
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