Option 1: Diurnal range of temperature is km. This statement is not clear and doesn`t provide any information about South India.

Option 2: Annual range of temperature is less. This means that the difference between the highest and lowest temperatures throughout the year is not significant in South India. This statement is correct as South India generally experiences a relatively stable and moderate climate with less temperature fluctuations.

Option 3: Temperature is high throughout the year. This statement is correct as South India has a tropical climate, with temperatures generally remaining high throughout the year.

Option 4: Extreme climatic conditions are found. This statement is not correct. South India does not experience extreme climatic conditions like extreme cold or hot temperatures, hurricanes, or blizzards. It has a more moderate climate compared to some other regions in India.

Therefore, the correct answer is option 4.