In India, the 20°C isothermal line of January locates in

Correct option is A

The 20°C isothermal line of January in India is located parallel to the Tropic of Cancer but to the South of it. This isothermal line, which represents areas experiencing an average temperature of 20°C in January, typically runs across the central part of India. This delineation reflects the thermal gradient during winter, where regions north of this line experience cooler temperatures, while regions to the south enjoy warmer weather. The Tropic of Cancer, which passes through the middle of India, acts as a reference point for understanding the distribution of temperature across the country. Therefore, the 20°C isothermal line's positioning to the south of the Tropic of Cancer indicates the warmer climatic conditions prevailing in the southern parts of India during January.