Answer :
The question is about the historical record of water levels in the Yamuna River, which pertains to the field of Geography as it involves the study of physical features of the Earth and how natural phenomena like rivers behave. In particular, this question deals with measuring and recording water levels, which is important for flood prediction and management.
To select the correct answer from the given options, we must consider the historical data records for the Yamuna River, especially during flood seasons. Historically, the record mentions that the Yamuna River reached a high water level of 207.49 meters.
Therefore, the all-time earlier record of the water level in the Yamuna is (b) 207.49 metres.
This knowledge is crucial as it informs infrastructure planning, flood prevention strategies, and emergency responses in regions surrounding the Yamuna River, particularly in areas like Delhi, which are significantly impacted by changes in the river's water levels.
