On the first day of January 2025, the Indian Meteorological Department [IMD] announced that 2024 was the hottest year on record. A study by the Council on Energy, Environment and Water shows that nearly eight out of ten Indians live in districts that are at risk of either a flood, a cyclone, or a drought. Nearly twenty-three States in India are heatwave-prone. __________________________. In the summer of 2024, India recorded more than 44,000 cases of heatstroke and over 300 heat-related mortalities, as per the bulletin of the Ministry of Health and Family Welfare. Water reservoirs and the energy demand that keeps India powered are impacted too. During a ten-day-long heatwave in Delhi, peak power demand was 16% than the previous year.

The given passage talks about India’s rising temperatures and related climate risks, highlighting the serious effects on health, water, and energy demand. The blank requires a sentence that sums up the ongoing challenge posed by this increasing heat. Option D [The increasing heat stress remains a major challenge, affecting public health and economic productivity] perfectly captures this. It directly connects the risks mentioned earlier to their broader impacts, setting the stage for the statistics and consequences described next. 

Option A incorrectly minimises the impact of climate change. Option B introduces a detail about the monsoon that is unrelated to the paragraph’s main focus. Option C suggests compensation, which isn’t mentioned or relevant here. Only option d captures the serious, widespread challenge of heat stress in line with the paragraph’s tone and content.

The correct answer is therefore Option D.