The correct answer is: C. 15-20 miles per hour.
The local winds ‘loo’ blowing in Bihar have wind velocity of 15-20 miles per hour. It is a hot and dry wind that blows from the northwest during the summer months. It is caused by the difference in temperature between the land and the sea. The land heats up faster than the sea, and the hot air rises. This creates an area of low pressure over the land. The air from the sea then flows in to fill this low pressure area, creating the loo wind.
The loo wind can cause a lot of problems. It can cause dust storms, which can damage crops and property. It can also cause heatstroke and dehydration. People should take precautions when the loo wind is blowing, such as staying indoors and drinking plenty of fluids.
The other options are incorrect because they do not represent the correct wind velocity of the loo wind. Option A is too low, and option D is too high. Option B is the closest to the correct answer, but it is still not accurate.