Which one of the following is the best example of repeated falls in sea level, giving rise to present-day extensive marshland?

1. The question asks for the best example of an extensive marshland formed due to repeated falls in sea level. 2. The Rann of Kutch is a vast seasonal salt marshland located in the Thar Desert in Kutch District of Gujarat, India. Geologically, it was once a shallow extension of the Arabian Sea. 3. Over time, processes including tectonic uplift and sedimentation, combined with significant fluctuations (including repeated falls or regressions) in sea level, isolated this area from the sea. 4. This geological history resulted in the formation of the present-day extensive saline marshland/salt desert characteristic of the Rann of Kutch. 5. Bhitarkanika Mangroves are primarily a deltaic mangrove ecosystem formed by river deposition and tidal influence. 6. Marakkanam Salt Pans are coastal areas used for salt production, shaped by tidal flats and evaporation. 7. Naupada Swamp is a coastal wetland, but the Rann of Kutch provides a clearer and larger-scale example linked to significant sea level changes leading to an extensive marshland. 8. Therefore, the Rann of Kutch is the best example among the options.