Why Correct: Fishing provides the primary livelihood for Sundarbans residents, supplemented by honey collection, crab harvesting, and other non-timber forest products from the mangrove ecosystem.
Distractor Analysis: Rain-fed monocropping is minimal due to saline soil and tidal flooding. Tourism generates some income but remains seasonal and limited to specific zones. Construction of barrages and embankments provides temporary employment but not a sustainable basic livelihood.
Takeaway: The Sundarbans mangrove forest supports approximately 4.5 million people through fisheries and forest-based livelihoods, with tiger prawns and hilsa fish being major commercial species.