States suffering from loo:

Loo, also known as heatwave or heatstroke, is a severe weather condition characterized by extremely high temperatures, low humidity, and hot winds. It can lead to heat exhaustion, heatstroke, and even fatalities. In India, loo is a common phenomenon during the summer months, particularly in the northern and central parts of the country. Let's analyze the given options to determine which states suffer from loo.

a) Chattisgarh:
Chattisgarh is a state located in central India. It experiences hot summers with temperatures often soaring above 40 degrees Celsius. The state is prone to heatwaves, and the loo phenomenon is observed here. Therefore, Chattisgarh can be considered a state that suffers from loo.

b) Tamil Nadu:
Tamil Nadu is a state located in the southern part of India. It has a tropical climate with hot and humid summers. While the state does experience high temperatures, it is not known for severe heatwaves or loo. Hence, Tamil Nadu cannot be considered a state that suffers from loo.

c) Kerala:
Kerala is also a state situated in the southern part of India. It has a unique geographical location with a coastal belt and Western Ghats. The state experiences a moderate climate throughout the year. Kerala is not known for extreme temperatures or heatwaves. Therefore, Kerala is not a state that suffers from loo.

d) None of these:
Based on the analysis above, it is evident that Chattisgarh is the only state among the given options that suffers from loo. Hence, the correct answer is option 'D' - None of these.

Conclusion:
Loo is a weather condition characterized by high temperatures, low humidity, and hot winds. Chattisgarh is the only state among the given options that suffers from loo. Tamil Nadu and Kerala, on the other hand, do not experience severe heatwaves or loo.