The correct answer is "Both I and II" because the report indicates that persistent wet-bulb temperatures exceeding 35 °C could lead to severe climate-related challenges in India. Statement I is valid as the increasing temperatures can exacerbate weather extremes, leading to more frequent flooding, droughts, and cyclones due to altered precipitation patterns. Statement II accurately reflects the biological implications of such high temperatures, as excessive humidity at elevated temperatures makes it difficult for humans and animals to cool their bodies through perspiration, leading to potential health crises. This aligns with climate science principles covered in UPSC materials, which discuss the impacts of climate change on both environmental and human health.